21367792 has 20 divisors (see below), whose sum is σ = 41682600. Its totient is φ = 10611008.

The previous prime is 21367781. The next prime is 21367807. The reversal of 21367792 is 29776312.

It is a congruent number.

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, 2098 + ... + 6865.

It is an arithmetic number, because the mean of its divisors is an integer number (2084130).

Almost surely, 2^21367792 is an apocalyptic number.

It is an amenable number.

21367792 is a deficient number, since it is larger than the sum of its proper divisors (20314808).

21367792 is a wasteful number, since it uses less digits than its factorization.

21367792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9120 (or 9114 counting only the distinct ones).

The product of its digits is 31752, while the sum is 37.

The square root of 21367792 is about 4622.5309084959. The cubic root of 21367792 is about 277.4937563187.

The spelling of 21367792 in words is "twenty-one million, three hundred sixty-seven thousand, seven hundred ninety-two".