21110312 has 16 divisors (see below), whose sum is σ = 39700500. Its totient is φ = 10523520.

The previous prime is 21110263. The next prime is 21110363. The reversal of 21110312 is 21301112.

It can be written as a sum of positive squares in 2 ways, for example, as 21104836 + 5476 = 4594^2 + 74^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21110293 and 21110302.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989 + ... + 6572.

Almost surely, 2^21110312 is an apocalyptic number.

It is an amenable number.

21110312 is a deficient number, since it is larger than the sum of its proper divisors (18590188).

21110312 is a wasteful number, since it uses less digits than its factorization.

21110312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916 (or 7912 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21110312 is about 4594.5959561206. The cubic root of 21110312 is about 276.3746574710.

Adding to 21110312 its reverse (21301112), we get a palindrome (42411424).

The spelling of 21110312 in words is "twenty-one million, one hundred ten thousand, three hundred twelve".