21363597 has 12 divisors (see below), whose sum is σ = 31039164. Its totient is φ = 14159040.

The previous prime is 21363593. The next prime is 21363599. The reversal of 21363597 is 79536312.

21363597 is a `hidden beast` number, since 2 + 1 + 3 + 63 + 597 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12489156 + 8874441 = 3534^2 + 2979^2 .

It is not a de Polignac number, because 21363597 - 2² = 21363593 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363593) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5304 + ... + 8417.

It is an arithmetic number, because the mean of its divisors is an integer number (2586597).

Almost surely, 2^21363597 is an apocalyptic number.

It is an amenable number.

21363597 is a deficient number, since it is larger than the sum of its proper divisors (9675567).

21363597 is a wasteful number, since it uses less digits than its factorization.

21363597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13900 (or 13897 counting only the distinct ones).

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

The square root of 21363597 is about 4622.0771304685. The cubic root of 21363597 is about 277.4755956138.

The spelling of 21363597 in words is "twenty-one million, three hundred sixty-three thousand, five hundred ninety-seven".