21600791 has 2 divisors, whose sum is σ = 21600792. Its totient is φ = 21600790.

The previous prime is 21600779. The next prime is 21600797. The reversal of 21600791 is 19700612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21600791 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21600791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21600797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800395 + 10800396.

It is an arithmetic number, because the mean of its divisors is an integer number (10800396).

Almost surely, 2^21600791 is an apocalyptic number.

21600791 is a deficient number, since it is larger than the sum of its proper divisors (1).

21600791 is an equidigital number, since it uses as much as digits as its factorization.

21600791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 21600791 is about 4647.6651127206. The cubic root of 21600791 is about 278.4987295093.

The spelling of 21600791 in words is "twenty-one million, six hundred thousand, seven hundred ninety-one".