31122103220 has 24 divisors (see below), whose sum is σ = 70383834024. Its totient is φ = 11491238016.

The previous prime is 31122103153. The next prime is 31122103231. The reversal of 31122103220 is 2230122113.

It can be written as a sum of positive squares in 4 ways, for example, as 103144336 + 31018958884 = 10156^2 + 176122^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59849939 + ... + 59850458.

It is an arithmetic number, because the mean of its divisors is an integer number (2932659751).

Almost surely, 2^31122103220 is an apocalyptic number.

It is an amenable number.

31122103220 is an abundant number, since it is smaller than the sum of its proper divisors (39261730804).

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

31122103220 is a wasteful number, since it uses less digits than its factorization.

31122103220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119700419 (or 119700417 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31122103220 its reverse (2230122113), we get a palindrome (33352225333).

The spelling of 31122103220 in words is "thirty-one billion, one hundred twenty-two million, one hundred three thousand, two hundred twenty".