21692764 has 6 divisors (see below), whose sum is σ = 37962344. Its totient is φ = 10846380.

The previous prime is 21692729. The next prime is 21692773. The reversal of 21692764 is 46729612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2711592 + ... + 2711599.

Almost surely, 2^21692764 is an apocalyptic number.

It is an amenable number.

21692764 is a deficient number, since it is larger than the sum of its proper divisors (16269580).

21692764 is a wasteful number, since it uses less digits than its factorization.

21692764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5423195 (or 5423193 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 21692764 is about 4657.5491409109. The cubic root of 21692764 is about 278.8934387483.

The spelling of 21692764 in words is "twenty-one million, six hundred ninety-two thousand, seven hundred sixty-four".