21331023100 has 18 divisors (see below), whose sum is σ = 46288320344. Its totient is φ = 8532409200.

The previous prime is 21331023079. The next prime is 21331023127. The reversal of 21331023100 is 132013312.

It is a super-2 number, since 2×21331023100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106655016 + ... + 106655215.

Almost surely, 2^21331023100 is an apocalyptic number.

21331023100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331023100 is an abundant number, since it is smaller than the sum of its proper divisors (24957297244).

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

21331023100 is a wasteful number, since it uses less digits than its factorization.

21331023100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213310245 (or 213310238 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21331023100 its reverse (132013312), we get a palindrome (21463036412).

The spelling of 21331023100 in words is "twenty-one billion, three hundred thirty-one million, twenty-three thousand, one hundred".