21331003100 has 72 divisors (see below), whose sum is σ = 50560680576. Its totient is φ = 7746840000.

The previous prime is 21331003081. The next prime is 21331003123. The reversal of 21331003100 is 130013312.

It is a super-2 number, since 2×21331003100² (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 23 ways as a sum of consecutive naturals, for example, 880145 + ... + 904055.

Almost surely, 2^21331003100 is an apocalyptic number.

21331003100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21331003100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25280340288).

21331003100 is an abundant number, since it is smaller than the sum of its proper divisors (29229677476).

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

21331003100 is a wasteful number, since it uses less digits than its factorization.

21331003100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24747 (or 24740 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21331003100 its reverse (130013312), we get a palindrome (21461016412).

The spelling of 21331003100 in words is "twenty-one billion, three hundred thirty-one million, three thousand, one hundred".