21900766 has 16 divisors (see below), whose sum is σ = 33629904. Its totient is φ = 10692864.

The previous prime is 21900751. The next prime is 21900773. The reversal of 21900766 is 66700912.

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, 32206 + ... + 32878.

It is an arithmetic number, because the mean of its divisors is an integer number (2101869).

Almost surely, 2^21900766 is an apocalyptic number.

21900766 is a deficient number, since it is larger than the sum of its proper divisors (11729138).

21900766 is a wasteful number, since it uses less digits than its factorization.

21900766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 21900766 is about 4679.8254240944. The cubic root of 21900766 is about 279.7819986808.

The spelling of 21900766 in words is "twenty-one million, nine hundred thousand, seven hundred sixty-six".