31102140220 has 48 divisors (see below), whose sum is σ = 69194230560. Its totient is φ = 11702657024.

The previous prime is 31102140187. The next prime is 31102140229. The reversal of 31102140220 is 2204120113.

It is a junction number, because it is equal to n+sod(n) for n = 31102140194 and 31102140203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31102140229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624396 + ... + 672364.

It is an arithmetic number, because the mean of its divisors is an integer number (1441546470).

Almost surely, 2^31102140220 is an apocalyptic number.

It is an amenable number.

31102140220 is an abundant number, since it is smaller than the sum of its proper divisors (38092090340).

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

31102140220 is a wasteful number, since it uses less digits than its factorization.

31102140220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49902 (or 49900 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31102140220 its reverse (2204120113), we get a palindrome (33306260333).

The spelling of 31102140220 in words is "thirty-one billion, one hundred two million, one hundred forty thousand, two hundred twenty".