31421312013 has 64 divisors (see below), whose sum is σ = 53265848832. Its totient is φ = 16031831040.

The previous prime is 31421312011. The next prime is 31421312053. The reversal of 31421312013 is 31021312413.

It is not a de Polignac number, because 31421312013 - 2¹ = 31421312011 is a prime.

It is a super-2 number, since 2×31421312013² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421312011) 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 63 ways as a sum of consecutive naturals, for example, 1738483 + ... + 1756463.

It is an arithmetic number, because the mean of its divisors is an integer number (832278888).

Almost surely, 2^31421312013 is an apocalyptic number.

It is an amenable number.

31421312013 is a deficient number, since it is larger than the sum of its proper divisors (21844536819).

31421312013 is a wasteful number, since it uses less digits than its factorization.

31421312013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18214.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31421312013 its reverse (31021312413), we get a palindrome (62442624426).

The spelling of 31421312013 in words is "thirty-one billion, four hundred twenty-one million, three hundred twelve thousand, thirteen".