31212313424 has 20 divisors (see below), whose sum is σ = 60487935444. Its totient is φ = 15602523648.

The previous prime is 31212313423. The next prime is 31212313471. The reversal of 31212313424 is 42431321213.

It can be written as a sum of positive squares in 2 ways, for example, as 13603023424 + 17609290000 = 116632^2 + 132700^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31212313393 and 31212313402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212313421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155507 + ... + 294290.

Almost surely, 2^31212313424 is an apocalyptic number.

It is an amenable number.

31212313424 is a deficient number, since it is larger than the sum of its proper divisors (29275622020).

31212313424 is a wasteful number, since it uses less digits than its factorization.

31212313424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454142 (or 454136 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

Adding to 31212313424 its reverse (42431321213), we get a palindrome (73643634637).

The spelling of 31212313424 in words is "thirty-one billion, two hundred twelve million, three hundred thirteen thousand, four hundred twenty-four".