21764332 has 6 divisors (see below), whose sum is σ = 38087588. Its totient is φ = 10882164.

The previous prime is 21764299. The next prime is 21764341. The reversal of 21764332 is 23346712.

It is a super-2 number, since 2×21764332² = 947372294812448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21764332.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2720538 + ... + 2720545.

Almost surely, 2^21764332 is an apocalyptic number.

It is an amenable number.

21764332 is a deficient number, since it is larger than the sum of its proper divisors (16323256).

21764332 is a wasteful number, since it uses less digits than its factorization.

21764332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5441087 (or 5441085 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 21764332 is about 4665.2258251879. The cubic root of 21764332 is about 279.1998071990.

The spelling of 21764332 in words is "twenty-one million, seven hundred sixty-four thousand, three hundred thirty-two".