121000012201021 has 4 divisors (see below), whose sum is σ = 123951232010844. Its totient is φ = 118048792391200.

The previous prime is 121000012201001. The next prime is 121000012201091. The reversal of 121000012201021 is 120102210000121.

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 4394871996025 + 116605140204996 = 2096395^2 + 10798386^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000012201021 - 2⁵ = 121000012200989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121000012200992 and 121000012201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000012201001) 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, 1475609904850 + ... + 1475609904931.

It is an arithmetic number, because the mean of its divisors is an integer number (30987808002711).

Almost surely, 2^{121000012201021} is an apocalyptic number.

It is an amenable number.

121000012201021 is a deficient number, since it is larger than the sum of its proper divisors (2951219809823).

121000012201021 is an equidigital number, since it uses as much as digits as its factorization.

121000012201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951219809822.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121000012201021 its reverse (120102210000121), we get a palindrome (241102222201142).

The spelling of 121000012201021 in words is "one hundred twenty-one trillion, twelve million, two hundred one thousand, twenty-one".