21012320322100 has 72 divisors (see below), whose sum is σ = 48095120951360. Its totient is φ = 7946212907520.

The previous prime is 21012320322061. The next prime is 21012320322137. The reversal of 21012320322100 is 122302321012.

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 10429029 + ... + 12279628.

Almost surely, 2^{21012320322100} is an apocalyptic number.

21012320322100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012320322100 is an abundant number, since it is smaller than the sum of its proper divisors (27082800629260).

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

21012320322100 is a wasteful number, since it uses less digits than its factorization.

21012320322100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22709177 (or 22709170 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21012320322100 its reverse (122302321012), we get a palindrome (21134622643112).

The spelling of 21012320322100 in words is "twenty-one trillion, twelve billion, three hundred twenty million, three hundred twenty-two thousand, one hundred".