31213323011 has 12 divisors (see below), whose sum is σ = 33814952280. Its totient is φ = 28798735680.

The previous prime is 31213322989. The next prime is 31213323061. The reversal of 31213323011 is 11032331213.

It is not a de Polignac number, because 31213323011 - 2⁶ = 31213322947 is a prime.

It is a super-2 number, since 2×31213323011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213323061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325871 + ... + 410631.

It is an arithmetic number, because the mean of its divisors is an integer number (2817912690).

Almost surely, 2^31213323011 is an apocalyptic number.

31213323011 is a deficient number, since it is larger than the sum of its proper divisors (2601629269).

31213323011 is a wasteful number, since it uses less digits than its factorization.

31213323011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86966 (or 86953 counting only the distinct ones).

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

Adding to 31213323011 its reverse (11032331213), we get a palindrome (42245654224).

The spelling of 31213323011 in words is "thirty-one billion, two hundred thirteen million, three hundred twenty-three thousand, eleven".