21031003012 has 24 divisors (see below), whose sum is σ = 38472412160. Its totient is φ = 10047473280.

The previous prime is 21031002973. The next prime is 21031003067. The reversal of 21031003012 is 21030013012.

It is a junction number, because it is equal to n+sod(n) for n = 21031002983 and 21031003001.

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, 1063653 + ... + 1083244.

Almost surely, 2^21031003012 is an apocalyptic number.

It is an amenable number.

21031003012 is a deficient number, since it is larger than the sum of its proper divisors (17441409148).

21031003012 is a wasteful number, since it uses less digits than its factorization.

21031003012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147011 (or 2147009 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21031003012 its reverse (21030013012), we get a palindrome (42061016024).

The spelling of 21031003012 in words is "twenty-one billion, thirty-one million, three thousand, twelve".