21310031012 has 24 divisors (see below), whose sum is σ = 39986069760. Its totient is φ = 9901307520.

The previous prime is 21310030999. The next prime is 21310031023. The reversal of 21310031012 is 21013001312.

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, 1978064 + ... + 1988807.

It is an arithmetic number, because the mean of its divisors is an integer number (1666086240).

Almost surely, 2^21310031012 is an apocalyptic number.

It is an amenable number.

21310031012 is a deficient number, since it is larger than the sum of its proper divisors (18676038748).

21310031012 is a wasteful number, since it uses less digits than its factorization.

21310031012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966971 (or 3966969 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21310031012 its reverse (21013001312), we get a palindrome (42323032324).

The spelling of 21310031012 in words is "twenty-one billion, three hundred ten million, thirty-one thousand, twelve".