21036976 has 20 divisors (see below), whose sum is σ = 41708392. Its totient is φ = 10273536.

The previous prime is 21036959. The next prime is 21036991. The reversal of 21036976 is 67963012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14601 + ... + 15976.

Almost surely, 2^21036976 is an apocalyptic number.

It is an amenable number.

21036976 is a deficient number, since it is larger than the sum of its proper divisors (20671416).

21036976 is a wasteful number, since it uses less digits than its factorization.

21036976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30628 (or 30622 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 21036976 is about 4586.6083329624. The cubic root of 21036976 is about 276.0542496456.

Adding to 21036976 its reverse (67963012), we get a palindrome (88999988).

The spelling of 21036976 in words is "twenty-one million, thirty-six thousand, nine hundred seventy-six".