31221100023000 has 64 divisors (see below), whose sum is σ = 97409832081120. Its totient is φ = 8325626672000.

The previous prime is 31221100022989. The next prime is 31221100023031. The reversal of 31221100023000 is 32000112213.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5203513671 + ... + 5203519670.

Almost surely, 2^{31221100023000} is an apocalyptic number.

31221100023000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31221100023000 is an abundant number, since it is smaller than the sum of its proper divisors (66188732058120).

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

31221100023000 is a wasteful number, since it uses less digits than its factorization.

31221100023000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10407033365 (or 10407033351 counting only the distinct ones).

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

Adding to 31221100023000 its reverse (32000112213), we get a palindrome (31253100135213).

The spelling of 31221100023000 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred million, twenty-three thousand".