31220403100 has 36 divisors (see below), whose sum is σ = 71733471264. Its totient is φ = 11753562880.

The previous prime is 31220403079. The next prime is 31220403131. The reversal of 31220403100 is 130402213.

It is a happy number.

It is a super-2 number, since 2×31220403100² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 9180772 + ... + 9184171.

It is an arithmetic number, because the mean of its divisors is an integer number (1992596424).

Almost surely, 2^31220403100 is an apocalyptic number.

It is an amenable number.

31220403100 is an abundant number, since it is smaller than the sum of its proper divisors (40513068164).

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

31220403100 is a wasteful number, since it uses less digits than its factorization.

31220403100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18364974 (or 18364967 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31220403100 its reverse (130402213), we get a palindrome (31350805313).

The spelling of 31220403100 in words is "thirty-one billion, two hundred twenty million, four hundred three thousand, one hundred".