21310012 has 12 divisors (see below), whose sum is σ = 38578680. Its totient is φ = 10287536.

The previous prime is 21310007. The next prime is 21310021. The reversal of 21310012 is 21001312.

It is a super-2 number, since 2×21310012² = 908233222880288, which 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91738 + ... + 91969.

It is an arithmetic number, because the mean of its divisors is an integer number (3214890).

Almost surely, 2^21310012 is an apocalyptic number.

It is an amenable number.

21310012 is a deficient number, since it is larger than the sum of its proper divisors (17268668).

21310012 is a wasteful number, since it uses less digits than its factorization.

21310012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183740 (or 183738 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21310012 is about 4616.2768547824. The cubic root of 21310012 is about 277.2434097071.

Adding to 21310012 its reverse (21001312), we get a palindrome (42311324).

The spelling of 21310012 in words is "twenty-one million, three hundred ten thousand, twelve".