21202012212100 has 36 divisors (see below), whose sum is σ = 46011557794048. Its totient is φ = 8480216628000.

The previous prime is 21202012212067. The next prime is 21202012212103. The reversal of 21202012212100 is 121221020212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21202012212103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5902896 + ... + 8789095.

Almost surely, 2^{21202012212100} is an apocalyptic number.

21202012212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202012212100 is an abundant number, since it is smaller than the sum of its proper divisors (24809545581948).

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

21202012212100 is a wasteful number, since it uses less digits than its factorization.

21202012212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14706436 (or 14706429 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202012212100 its reverse (121221020212), we get a palindrome (21323233232312).

The spelling of 21202012212100 in words is "twenty-one trillion, two hundred two billion, twelve million, two hundred twelve thousand, one hundred".