21312032320100 has 72 divisors (see below), whose sum is σ = 46417864483200. Its totient is φ = 8493347018880.

The previous prime is 21312032320069. The next prime is 21312032320109. The reversal of 21312032320100 is 102323021312.

It is a super-2 number, since 2×21312032320100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (21312032320109) 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 23 ways as a sum of consecutive naturals, for example, 189638726 + ... + 189751074.

Almost surely, 2^{21312032320100} is an apocalyptic number.

21312032320100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312032320100 is an abundant number, since it is smaller than the sum of its proper divisors (25105832163100).

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

21312032320100 is a wasteful number, since it uses less digits than its factorization.

21312032320100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119349 (or 119342 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21312032320100 its reverse (102323021312), we get a palindrome (21414355341412).

The spelling of 21312032320100 in words is "twenty-one trillion, three hundred twelve billion, thirty-two million, three hundred twenty thousand, one hundred".