31030021100 has 36 divisors (see below), whose sum is σ = 72514775424. Its totient is φ = 11457238080.

The previous prime is 31030021097. The next prime is 31030021151. The reversal of 31030021100 is 112003013.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11933324 + ... + 11935923.

Almost surely, 2^31030021100 is an apocalyptic number.

It is an amenable number.

31030021100 is an abundant number, since it is smaller than the sum of its proper divisors (41484754324).

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

31030021100 is a wasteful number, since it uses less digits than its factorization.

31030021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23869274 (or 23869267 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 31030021100 its reverse (112003013), we get a palindrome (31142024113).

The spelling of 31030021100 in words is "thirty-one billion, thirty million, twenty-one thousand, one hundred".