21031331031100 has 36 divisors (see below), whose sum is σ = 49148602828024. Its totient is φ = 7765414534080.

The previous prime is 21031331031097. The next prime is 21031331031101. The reversal of 21031331031100 is 113013313012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031331031101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8088972174 + ... + 8088974773.

Almost surely, 2^{21031331031100} is an apocalyptic number.

21031331031100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031331031100 is an abundant number, since it is smaller than the sum of its proper divisors (28117271796924).

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

21031331031100 is a wasteful number, since it uses less digits than its factorization.

21031331031100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16177946974 (or 16177946967 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21031331031100 its reverse (113013313012), we get a palindrome (21144344344112).

The spelling of 21031331031100 in words is "twenty-one trillion, thirty-one billion, three hundred thirty-one million, thirty-one thousand, one hundred".