21336597 has 6 divisors (see below), whose sum is σ = 30819542. Its totient is φ = 14224392.

The previous prime is 21336589. The next prime is 21336613. The reversal of 21336597 is 79563312.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 2099601 = 4386^2 + 1449^2 .

It is not a de Polignac number, because 21336597 - 2³ = 21336589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21336197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1185358 + ... + 1185375.

Almost surely, 2^21336597 is an apocalyptic number.

It is an amenable number.

21336597 is a deficient number, since it is larger than the sum of its proper divisors (9482945).

21336597 is a wasteful number, since it uses less digits than its factorization.

21336597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370739 (or 2370736 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 21336597 is about 4619.1554422860. The cubic root of 21336597 is about 277.3586521446.

The spelling of 21336597 in words is "twenty-one million, three hundred thirty-six thousand, five hundred ninety-seven".