31312120220311 has 48 divisors (see below), whose sum is σ = 38037854067840. Its totient is φ = 25667660168640.

The previous prime is 31312120220299. The next prime is 31312120220317. The reversal of 31312120220311 is 11302202121313.

It is not a de Polignac number, because 31312120220311 - 2²³ = 31312111831703 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 (31312120220317) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1820146036 + ... + 1820163238.

It is an arithmetic number, because the mean of its divisors is an integer number (792455293080).

Almost surely, 2^{31312120220311} is an apocalyptic number.

31312120220311 is a deficient number, since it is larger than the sum of its proper divisors (6725733847529).

31312120220311 is a wasteful number, since it uses less digits than its factorization.

31312120220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29324 (or 29317 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31312120220311 its reverse (11302202121313), we get a palindrome (42614322341624).

The spelling of 31312120220311 in words is "thirty-one trillion, three hundred twelve billion, one hundred twenty million, two hundred twenty thousand, three hundred eleven".