21135976 has 32 divisors (see below), whose sum is σ = 40953600. Its totient is φ = 10221120.

The previous prime is 21135971. The next prime is 21135997. The reversal of 21135976 is 67953112.

It is not an unprimeable number, because it can be changed into a prime (21135971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33181 + ... + 33811.

It is an arithmetic number, because the mean of its divisors is an integer number (1279800).

Almost surely, 2^21135976 is an apocalyptic number.

It is an amenable number.

21135976 is a deficient number, since it is larger than the sum of its proper divisors (19817624).

21135976 is a wasteful number, since it uses less digits than its factorization.

21135976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769 (or 765 counting only the distinct ones).

The product of its digits is 11340, while the sum is 34.

The square root of 21135976 is about 4597.3879540452. The cubic root of 21135976 is about 276.4866091853.

The spelling of 21135976 in words is "twenty-one million, one hundred thirty-five thousand, nine hundred seventy-six".