21031023120100 has 72 divisors (see below), whose sum is σ = 52373356585088. Its totient is φ = 7180716787200.

The previous prime is 21031023120083. The next prime is 21031023120137. The reversal of 21031023120100 is 102132013012.

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, 62163912 + ... + 62501311.

Almost surely, 2^{21031023120100} is an apocalyptic number.

21031023120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031023120100 is an abundant number, since it is smaller than the sum of its proper divisors (31342333464988).

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

21031023120100 is a wasteful number, since it uses less digits than its factorization.

21031023120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124665485 (or 124665478 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21031023120100 its reverse (102132013012), we get a palindrome (21133155133112).

The spelling of 21031023120100 in words is "twenty-one trillion, thirty-one billion, twenty-three million, one hundred twenty thousand, one hundred".