21088799 has 2 divisors, whose sum is σ = 21088800. Its totient is φ = 21088798.

The previous prime is 21088787. The next prime is 21088819. The reversal of 21088799 is 99788012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21088799 - 2¹⁶ = 21023263 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21018799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10544399 + 10544400.

It is an arithmetic number, because the mean of its divisors is an integer number (10544400).

Almost surely, 2^21088799 is an apocalyptic number.

21088799 is a deficient number, since it is larger than the sum of its proper divisors (1).

21088799 is an equidigital number, since it uses as much as digits as its factorization.

21088799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 21088799 is about 4592.2542394776. The cubic root of 21088799 is about 276.2807433555.

It can be divided in two parts, 2 and 1088799, that added together give a palindrome (1088801).

The spelling of 21088799 in words is "twenty-one million, eighty-eight thousand, seven hundred ninety-nine".