21211102222100 has 72 divisors (see below), whose sum is σ = 52604280402240. Its totient is φ = 7272274648320.

The previous prime is 21211102222099. The next prime is 21211102222139. The reversal of 21211102222100 is 122220111212.

It is a congruent number.

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, 61939547 + ... + 62281053.

Almost surely, 2^{21211102222100} is an apocalyptic number.

21211102222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211102222100 is an abundant number, since it is smaller than the sum of its proper divisors (31393178180140).

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

21211102222100 is a wasteful number, since it uses less digits than its factorization.

21211102222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430257 (or 430250 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21211102222100 its reverse (122220111212), we get a palindrome (21333322333312).

The spelling of 21211102222100 in words is "twenty-one trillion, two hundred eleven billion, one hundred two million, two hundred twenty-two thousand, one hundred".