31122113220 has 144 divisors (see below), whose sum is σ = 106800378048. Its totient is φ = 7544741760.

The previous prime is 31122113213. The next prime is 31122113261. The reversal of 31122113220 is 2231122113.

31122113220 is a `hidden beast` number, since 311 + 22 + 11 + 322 + 0 = 666.

It is a super-3 number, since 3×31122113220³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31122113193 and 31122113202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 237619 + ... + 344538.

It is an arithmetic number, because the mean of its divisors is an integer number (741669292).

Almost surely, 2^31122113220 is an apocalyptic number.

31122113220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31122113220 is an abundant number, since it is smaller than the sum of its proper divisors (75678264828).

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

31122113220 is a wasteful number, since it uses less digits than its factorization.

31122113220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582192 (or 582178 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31122113220 its reverse (2231122113), we get a palindrome (33353235333).

The spelling of 31122113220 in words is "thirty-one billion, one hundred twenty-two million, one hundred thirteen thousand, two hundred twenty".