31213122421200 has 120 divisors (see below), whose sum is σ = 100089011455776. Its totient is φ = 8314926912000.

The previous prime is 31213122421199. The next prime is 31213122421241. The reversal of 31213122421200 is 212422131213.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×31213122421200² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 12228691 + ... + 14559090.

Almost surely, 2^{31213122421200} is an apocalyptic number.

31213122421200 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31213122421200 is an abundant number, since it is smaller than the sum of its proper divisors (68875889034576).

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

31213122421200 is a wasteful number, since it uses less digits than its factorization.

31213122421200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26788773 (or 26788762 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 31213122421200 its reverse (212422131213), we get a palindrome (31425544552413).

The spelling of 31213122421200 in words is "thirty-one trillion, two hundred thirteen billion, one hundred twenty-two million, four hundred twenty-one thousand, two hundred".