21600790 has 16 divisors (see below), whose sum is σ = 39167712. Its totient is φ = 8576704.

The previous prime is 21600779. The next prime is 21600791. The reversal of 21600790 is 9700612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600791) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6514 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (2447982).

Almost surely, 2^21600790 is an apocalyptic number.

21600790 is a deficient number, since it is larger than the sum of its proper divisors (17566922).

21600790 is a wasteful number, since it uses less digits than its factorization.

21600790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15911.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 21600790 is about 4647.6650051397. The cubic root of 21600790 is about 278.4987252117.

The spelling of 21600790 in words is "twenty-one million, six hundred thousand, seven hundred ninety".