31220233223231 has 16 divisors (see below), whose sum is σ = 34409431812000. Its totient is φ = 28149777272448.

The previous prime is 31220233223191. The next prime is 31220233223273. The reversal of 31220233223231 is 13232233202213.

It is not a de Polignac number, because 31220233223231 - 2⁶ = 31220233223167 is a prime.

It is a super-2 number, since 2×31220233223231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220233223194 and 31220233223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220235223231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129511256 + ... + 129752093.

It is an arithmetic number, because the mean of its divisors is an integer number (2150589488250).

Almost surely, 2^{31220233223231} is an apocalyptic number.

31220233223231 is a deficient number, since it is larger than the sum of its proper divisors (3189198588769).

31220233223231 is a wasteful number, since it uses less digits than its factorization.

31220233223231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259263578.

The product of its (nonzero) digits is 15552, while the sum is 29.

Adding to 31220233223231 its reverse (13232233202213), we get a palindrome (44452466425444).

The spelling of 31220233223231 in words is "thirty-one trillion, two hundred twenty billion, two hundred thirty-three million, two hundred twenty-three thousand, two hundred thirty-one".