21000202220100 has 72 divisors (see below), whose sum is σ = 60901561300608. Its totient is φ = 5587060726400.

The previous prime is 21000202220087. The next prime is 21000202220171. The reversal of 21000202220100 is 102220200012.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 81077979 + ... + 81336578.

It is an arithmetic number, because the mean of its divisors is an integer number (845855018064).

Almost surely, 2^{21000202220100} is an apocalyptic number.

21000202220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000202220100 is an abundant number, since it is smaller than the sum of its proper divisors (39901359080508).

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

21000202220100 is a wasteful number, since it uses less digits than its factorization.

21000202220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162415005 (or 162414998 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21000202220100 its reverse (102220200012), we get a palindrome (21102422420112).

The spelling of 21000202220100 in words is "twenty-one trillion, two hundred two million, two hundred twenty thousand, one hundred".