21338599 has 2 divisors, whose sum is σ = 21338600. Its totient is φ = 21338598.

The previous prime is 21338591. The next prime is 21338609. The reversal of 21338599 is 99583312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21338599 - 2³ = 21338591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21338591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10669299 + 10669300.

It is an arithmetic number, because the mean of its divisors is an integer number (10669300).

Almost surely, 2^21338599 is an apocalyptic number.

21338599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21338599 is an equidigital number, since it uses as much as digits as its factorization.

21338599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 21338599 is about 4619.3721434844. The cubic root of 21338599 is about 277.3673266715.

The spelling of 21338599 in words is "twenty-one million, three hundred thirty-eight thousand, five hundred ninety-nine".