31112223220 has 24 divisors (see below), whose sum is σ = 70361490024. Its totient is φ = 11487590016.

The previous prime is 31112223173. The next prime is 31112223223. The reversal of 31112223220 is 2232221113.

It can be written as a sum of positive squares in 4 ways, for example, as 7594773904 + 23517449316 = 87148^2 + 153354^2 .

It is a super-2 number, since 2×31112223220² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112223223) 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 7 ways as a sum of consecutive naturals, for example, 59830939 + ... + 59831458.

It is an arithmetic number, because the mean of its divisors is an integer number (2931728751).

Almost surely, 2^31112223220 is an apocalyptic number.

It is an amenable number.

31112223220 is an abundant number, since it is smaller than the sum of its proper divisors (39249266804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31112223220 is a wasteful number, since it uses less digits than its factorization.

31112223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119662419 (or 119662417 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31112223220 its reverse (2232221113), we get a palindrome (33344444333).

The spelling of 31112223220 in words is "thirty-one billion, one hundred twelve million, two hundred twenty-three thousand, two hundred twenty".