31212300402 has 40 divisors (see below), whose sum is σ = 70061795100. Its totient is φ = 10385784576.

The previous prime is 31212300401. The next prime is 31212300433. The reversal of 31212300402 is 20400321213.

31212300402 is a `hidden beast` number, since 31 + 2 + 1 + 230 + 0 + 402 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30702398841 + 509901561 = 175221^2 + 22581^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31212300401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 77127 + ... + 261482.

Almost surely, 2^31212300402 is an apocalyptic number.

31212300402 is an abundant number, since it is smaller than the sum of its proper divisors (38849494698).

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

31212300402 is a wasteful number, since it uses less digits than its factorization.

31212300402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339192 (or 339183 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31212300402 its reverse (20400321213), we get a palindrome (51612621615).

The spelling of 31212300402 in words is "thirty-one billion, two hundred twelve million, three hundred thousand, four hundred two".