31213121303 has 32 divisors (see below), whose sum is σ = 40696516224. Its totient is φ = 23231619072.

The previous prime is 31213121287. The next prime is 31213121309. The reversal of 31213121303 is 30312131213.

It is a cyclic number.

It is not a de Polignac number, because 31213121303 - 2⁴ = 31213121287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213121309) 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 31 ways as a sum of consecutive naturals, for example, 4137551 + ... + 4145087.

It is an arithmetic number, because the mean of its divisors is an integer number (1271766132).

Almost surely, 2^31213121303 is an apocalyptic number.

31213121303 is a deficient number, since it is larger than the sum of its proper divisors (9483394921).

31213121303 is a wasteful number, since it uses less digits than its factorization.

31213121303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10251.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31213121303 its reverse (30312131213), we get a palindrome (61525252516).

The spelling of 31213121303 in words is "thirty-one billion, two hundred thirteen million, one hundred twenty-one thousand, three hundred three".