31331121213430 has 32 divisors (see below), whose sum is σ = 57623692999680. Its totient is φ = 12261645268320.

The previous prime is 31331121213389. The next prime is 31331121213449. The reversal of 31331121213430 is 3431212113313.

It is a super-2 number, since 2×31331121213430² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125713414 + ... + 125962393.

It is an arithmetic number, because the mean of its divisors is an integer number (1800740406240).

Almost surely, 2^{31331121213430} is an apocalyptic number.

31331121213430 is a deficient number, since it is larger than the sum of its proper divisors (26292571786250).

31331121213430 is a wasteful number, since it uses less digits than its factorization.

31331121213430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251676084.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 31331121213430 its reverse (3431212113313), we get a palindrome (34762333326743).

The spelling of 31331121213430 in words is "thirty-one trillion, three hundred thirty-one billion, one hundred twenty-one million, two hundred thirteen thousand, four hundred thirty".