21135692 has 12 divisors (see below), whose sum is σ = 39163320. Its totient is φ = 9946176.

The previous prime is 21135691. The next prime is 21135713. The reversal of 21135692 is 29653112.

It is not an unprimeable number, because it can be changed into a prime (21135691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155342 + ... + 155477.

It is an arithmetic number, because the mean of its divisors is an integer number (3263610).

Almost surely, 2^21135692 is an apocalyptic number.

It is an amenable number.

21135692 is a deficient number, since it is larger than the sum of its proper divisors (18027628).

21135692 is a wasteful number, since it uses less digits than its factorization.

21135692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310840 (or 310838 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 21135692 is about 4597.3570668374. The cubic root of 21135692 is about 276.4853708142.

The spelling of 21135692 in words is "twenty-one million, one hundred thirty-five thousand, six hundred ninety-two".