21000202222100 has 36 divisors (see below), whose sum is σ = 45593373545664. Its totient is φ = 8395853290080.

The previous prime is 21000202222079. The next prime is 21000202222117. The reversal of 21000202222100 is 122220200012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52645292 + ... + 53042691.

Almost surely, 2^{21000202222100} is an apocalyptic number.

21000202222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000202222100 is an abundant number, since it is smaller than the sum of its proper divisors (24593171323564).

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

21000202222100 is a wasteful number, since it uses less digits than its factorization.

21000202222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105689984 (or 105689977 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21000202222100 its reverse (122220200012), we get a palindrome (21122422422112).

The spelling of 21000202222100 in words is "twenty-one trillion, two hundred two million, two hundred twenty-two thousand, one hundred".