202121021121100 has 18 divisors (see below), whose sum is σ = 438602615833004. Its totient is φ = 80848408448400.

The previous prime is 202121021121091. The next prime is 202121021121109. The reversal of 202121021121100 is 1121120121202.

It is an interprime number because it is at equal distance from previous prime (202121021121091) and next prime (202121021121109).

It is not an unprimeable number, because it can be changed into a prime (202121021121109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1010605105506 + ... + 1010605105705.

Almost surely, 2^{202121021121100} is an apocalyptic number.

202121021121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121021121100 is an abundant number, since it is smaller than the sum of its proper divisors (236481594711904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

202121021121100 is a wasteful number, since it uses less digits than its factorization.

202121021121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021210211225 (or 2021210211218 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 202121021121100 its reverse (1121120121202), we get a palindrome (203242141242302).

The spelling of 202121021121100 in words is "two hundred two trillion, one hundred twenty-one billion, twenty-one million, one hundred twenty-one thousand, one hundred".