121201010221 has 4 divisors (see below), whose sum is σ = 121870629244. Its totient is φ = 120531391200.

The previous prime is 121201010171. The next prime is 121201010263. The reversal of 121201010221 is 122010102121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122010102121 = 113 ⋅1079735417.

It can be written as a sum of positive squares in 2 ways, for example, as 43980381225 + 77220628996 = 209715^2 + 277886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121201010221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201010291) 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, 334809240 + ... + 334809601.

It is an arithmetic number, because the mean of its divisors is an integer number (30467657311).

Almost surely, 2^121201010221 is an apocalyptic number.

It is an amenable number.

121201010221 is a deficient number, since it is larger than the sum of its proper divisors (669619023).

121201010221 is an equidigital number, since it uses as much as digits as its factorization.

121201010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669619022.

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

Adding to 121201010221 its reverse (122010102121), we get a palindrome (243211112342).

The spelling of 121201010221 in words is "one hundred twenty-one billion, two hundred one million, ten thousand, two hundred twenty-one".