31213123000 has 64 divisors (see below), whose sum is σ = 74592835200. Its totient is φ = 12219587200.

The previous prime is 31213122989. The next prime is 31213123033. The reversal of 31213123000 is 32131213.

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, 285055 + ... + 379054.

It is an arithmetic number, because the mean of its divisors is an integer number (1165513050).

Almost surely, 2^31213123000 is an apocalyptic number.

It is an amenable number.

31213123000 is an abundant number, since it is smaller than the sum of its proper divisors (43379712200).

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

31213123000 is a wasteful number, since it uses less digits than its factorization.

31213123000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664177 (or 664163 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31213123000 its reverse (32131213), we get a palindrome (31245254213).

The spelling of 31213123000 in words is "thirty-one billion, two hundred thirteen million, one hundred twenty-three thousand".