31023312213218 has 32 divisors (see below), whose sum is σ = 52078369996800. Its totient is φ = 13763569106880.

The previous prime is 31023312213199. The next prime is 31023312213287. The reversal of 31023312213218 is 81231221332013.

It is a super-2 number, since 2×31023312213218² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129042530 + ... + 129282717.

It is an arithmetic number, because the mean of its divisors is an integer number (1627449062400).

Almost surely, 2^{31023312213218} is an apocalyptic number.

31023312213218 is a deficient number, since it is larger than the sum of its proper divisors (21055057783582).

31023312213218 is a wasteful number, since it uses less digits than its factorization.

31023312213218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258325442.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 31023312213218 in words is "thirty-one trillion, twenty-three billion, three hundred twelve million, two hundred thirteen thousand, two hundred eighteen".