31212420525 has 576 divisors, whose sum is σ = 75221852160. Its totient is φ = 12597120000.

The previous prime is 31212420511. The next prime is 31212420571. The reversal of 31212420525 is 52502421213.

31212420525 is a `hidden beast` number, since 3 + 1 + 212 + 420 + 5 + 25 = 666.

It is not a de Polignac number, because 31212420525 - 2⁹ = 31212420013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 511678995 + ... + 511679055.

Almost surely, 2^31212420525 is an apocalyptic number.

It is an amenable number.

31212420525 is an abundant number, since it is smaller than the sum of its proper divisors (44009431635).

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

31212420525 is a wasteful number, since it uses less digits than its factorization.

31212420525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 31212420525 its reverse (52502421213), we get a palindrome (83714841738).

The spelling of 31212420525 in words is "thirty-one billion, two hundred twelve million, four hundred twenty thousand, five hundred twenty-five".