31023100021200 has 240 divisors, whose sum is σ = 115269229678080. Its totient is φ = 6985158428160.

The previous prime is 31023100021153. The next prime is 31023100021237. The reversal of 31023100021200 is 212000132013.

It is a tau number, because it is divible by the number of its divisors (240).

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 31023100021200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26998590 + ... + 28124189.

It is an arithmetic number, because the mean of its divisors is an integer number (480288456992).

Almost surely, 2^{31023100021200} is an apocalyptic number.

31023100021200 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31023100021200 is an abundant number, since it is smaller than the sum of its proper divisors (84246129656880).

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

31023100021200 is a wasteful number, since it uses less digits than its factorization.

31023100021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55122874 (or 55122863 counting only the distinct ones).

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

Adding to 31023100021200 its reverse (212000132013), we get a palindrome (31235100153213).

The spelling of 31023100021200 in words is "thirty-one trillion, twenty-three billion, one hundred million, twenty-one thousand, two hundred".