202100121021021 has 16 divisors (see below), whose sum is σ = 270836700444288. Its totient is φ = 134048488011200.

The previous prime is 202100121021013. The next prime is 202100121021061. The reversal of 202100121021021 is 120120121001202.

It is a cyclic number.

It is not a de Polignac number, because 202100121021021 - 2³ = 202100121021013 is a prime.

It is a super-2 number, since 2×202100121021021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202100121021061) 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, 82682536 + ... + 85091726.

It is an arithmetic number, because the mean of its divisors is an integer number (16927293777768).

Almost surely, 2^{202100121021021} is an apocalyptic number.

It is an amenable number.

202100121021021 is a deficient number, since it is larger than the sum of its proper divisors (68736579423267).

202100121021021 is a wasteful number, since it uses less digits than its factorization.

202100121021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551332.

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

Adding to 202100121021021 its reverse (120120121001202), we get a palindrome (322220242022223).

The spelling of 202100121021021 in words is "two hundred two trillion, one hundred billion, one hundred twenty-one million, twenty-one thousand, twenty-one".