21767852 has 6 divisors (see below), whose sum is σ = 38093748. Its totient is φ = 10883924.

The previous prime is 21767839. The next prime is 21767869. The reversal of 21767852 is 25876712.

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, 2720978 + ... + 2720985.

It is an arithmetic number, because the mean of its divisors is an integer number (6348958).

Almost surely, 2^21767852 is an apocalyptic number.

It is an amenable number.

21767852 is a deficient number, since it is larger than the sum of its proper divisors (16325896).

21767852 is a wasteful number, since it uses less digits than its factorization.

21767852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5441967 (or 5441965 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 21767852 is about 4665.6030692720. The cubic root of 21767852 is about 279.2148582827.

The spelling of 21767852 in words is "twenty-one million, seven hundred sixty-seven thousand, eight hundred fifty-two".