31320213103 has 4 divisors (see below), whose sum is σ = 31322884320. Its totient is φ = 31317541888.

The previous prime is 31320213097. The next prime is 31320213157. The reversal of 31320213103 is 30131202313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30131202313 = 457 ⋅65932609.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31320213103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320213203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317943 + ... + 1341496.

It is an arithmetic number, because the mean of its divisors is an integer number (7830721080).

Almost surely, 2^31320213103 is an apocalyptic number.

31320213103 is a deficient number, since it is larger than the sum of its proper divisors (2671217).

31320213103 is a wasteful number, since it uses less digits than its factorization.

31320213103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671216.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31320213103 its reverse (30131202313), we get a palindrome (61451415416).

The spelling of 31320213103 in words is "thirty-one billion, three hundred twenty million, two hundred thirteen thousand, one hundred three".