21312302100 has 36 divisors (see below), whose sum is σ = 61663594944. Its totient is φ = 5683280480.

The previous prime is 21312302041. The next prime is 21312302107. The reversal of 21312302100 is 120321312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21312302100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312302107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35520204 + ... + 35520803.

Almost surely, 2^21312302100 is an apocalyptic number.

21312302100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312302100 is an abundant number, since it is smaller than the sum of its proper divisors (40351292844).

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

21312302100 is a wasteful number, since it uses less digits than its factorization.

21312302100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71041024 (or 71041017 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21312302100 its reverse (120321312), we get a palindrome (21432623412).

The spelling of 21312302100 in words is "twenty-one billion, three hundred twelve million, three hundred two thousand, one hundred".