31220201311 has 12 divisors (see below), whose sum is σ = 35276341968. Its totient is φ = 27565659264.

The previous prime is 31220201303. The next prime is 31220201317. The reversal of 31220201311 is 11310202213.

It is not a de Polignac number, because 31220201311 - 2³ = 31220201303 is a prime.

It is a super-2 number, since 2×31220201311² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220201317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4012090 + ... + 4019863.

It is an arithmetic number, because the mean of its divisors is an integer number (2939695164).

Almost surely, 2^31220201311 is an apocalyptic number.

31220201311 is a deficient number, since it is larger than the sum of its proper divisors (4056140657).

31220201311 is a wasteful number, since it uses less digits than its factorization.

31220201311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8032002 (or 8031989 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31220201311 its reverse (11310202213), we get a palindrome (42530403524).

The spelling of 31220201311 in words is "thirty-one billion, two hundred twenty million, two hundred one thousand, three hundred eleven".