21867792 has 20 divisors (see below), whose sum is σ = 56491920. Its totient is φ = 7289248.

The previous prime is 21867773. The next prime is 21867821. The reversal of 21867792 is 29776812.

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 in 3 ways as a sum of consecutive naturals, for example, 227742 + ... + 227837.

It is an arithmetic number, because the mean of its divisors is an integer number (2824596).

Almost surely, 2^21867792 is an apocalyptic number.

It is an amenable number.

21867792 is an abundant number, since it is smaller than the sum of its proper divisors (34624128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21867792 is a wasteful number, since it uses less digits than its factorization.

21867792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455590 (or 455584 counting only the distinct ones).

The product of its digits is 84672, while the sum is 42.

The square root of 21867792 is about 4676.3011023671. The cubic root of 21867792 is about 279.6415140128.

The spelling of 21867792 in words is "twenty-one million, eight hundred sixty-seven thousand, seven hundred ninety-two".