21211000120100 has 72 divisors (see below), whose sum is σ = 52606973229888. Its totient is φ = 7271832355200.

The previous prime is 21211000120043. The next prime is 21211000120139. The reversal of 21211000120100 is 102100011212.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8982239 + ... + 11095161.

Almost surely, 2^{21211000120100} is an apocalyptic number.

21211000120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211000120100 is an abundant number, since it is smaller than the sum of its proper divisors (31395973109788).

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

21211000120100 is a wasteful number, since it uses less digits than its factorization.

21211000120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127285 (or 2127278 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21211000120100 its reverse (102100011212), we get a palindrome (21313100131312).

The spelling of 21211000120100 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty thousand, one hundred".