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BaseRepresentation
bin11011100011111111000001…
…101010110100000100011101
3120220012112021222022000201201
4123203333001222310010131
5111342032241433033041
61105451430022435501
734350602234352511
oct3343770152640435
9526175258260651
10121220111221021
113569618464531a
1211719329b92b91
135284013461357
1421d1128552141
15e0332ec2b631
hex6e3fc1ab411d

121220111221021 has 4 divisors (see below), whose sum is σ = 121220133742044. Its totient is φ = 121220088700000.

The previous prime is 121220111221007. The next prime is 121220111221031. The reversal of 121220111221021 is 120122111022121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77206360491225 + 44013750729796 = 8786715^2 + 6634286^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220111221021 - 219 = 121220110696733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220111221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220111221031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087271 + ... + 15709771.

It is an arithmetic number, because the mean of its divisors is an integer number (30305033435511).

Almost surely, 2121220111221021 is an apocalyptic number.

It is an amenable number.

121220111221021 is a deficient number, since it is larger than the sum of its proper divisors (22521023).

121220111221021 is an equidigital number, since it uses as much as digits as its factorization.

121220111221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22521022.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121220111221021 its reverse (120122111022121), we get a palindrome (241342222243142).

The spelling of 121220111221021 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, twenty-one".

Divisors: 1 8898521 13622501 121220111221021