201021201002121 has 16 divisors (see below), whose sum is σ = 268048850503680. Its totient is φ = 134003843260560.

The previous prime is 201021201002117. The next prime is 201021201002131. The reversal of 201021201002121 is 121200102120102.

It is not a de Polignac number, because 201021201002121 - 2² = 201021201002117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201021201002121.

It is not an unprimeable number, because it can be changed into a prime (201021201002101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3282966576 + ... + 3283027806.

It is an arithmetic number, because the mean of its divisors is an integer number (16753053156480).

Almost surely, 2^{201021201002121} is an apocalyptic number.

It is an amenable number.

201021201002121 is a deficient number, since it is larger than the sum of its proper divisors (67027649501559).

201021201002121 is a wasteful number, since it uses less digits than its factorization.

201021201002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127396.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201021201002121 its reverse (121200102120102), we get a palindrome (322221303122223).

The spelling of 201021201002121 in words is "two hundred one trillion, twenty-one billion, two hundred one million, two thousand, one hundred twenty-one".