21764692 has 24 divisors (see below), whose sum is σ = 40740840. Its totient is φ = 10137600.

The previous prime is 21764669. The next prime is 21764711. The reversal of 21764692 is 29646712.

It can be written as a sum of positive squares in 4 ways, for example, as 15634116 + 6130576 = 3954^2 + 2476^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5284 + ... + 8452.

It is an arithmetic number, because the mean of its divisors is an integer number (1697535).

Almost surely, 2^21764692 is an apocalyptic number.

It is an amenable number.

21764692 is a deficient number, since it is larger than the sum of its proper divisors (18976148).

21764692 is a wasteful number, since it uses less digits than its factorization.

21764692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291 (or 3289 counting only the distinct ones).

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

The square root of 21764692 is about 4665.2644083696. The cubic root of 21764692 is about 279.2013465889.

The spelling of 21764692 in words is "twenty-one million, seven hundred sixty-four thousand, six hundred ninety-two".