21364659 has 12 divisors (see below), whose sum is σ = 31097352. Its totient is φ = 14133600.

The previous prime is 21364657. The next prime is 21364661. The reversal of 21364659 is 95646312.

It is a happy number.

21364659 is a `hidden beast` number, since 2 + 1 + 3 + 646 + 5 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (21364657) and next prime (21364661).

It is not a de Polignac number, because 21364659 - 2¹ = 21364657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21364657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7882 + ... + 10239.

It is an arithmetic number, because the mean of its divisors is an integer number (2591446).

Almost surely, 2^21364659 is an apocalyptic number.

21364659 is a deficient number, since it is larger than the sum of its proper divisors (9732693).

21364659 is a wasteful number, since it uses less digits than its factorization.

21364659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18258 (or 18255 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 21364659 is about 4622.1920124547. The cubic root of 21364659 is about 277.4801933757.

The spelling of 21364659 in words is "twenty-one million, three hundred sixty-four thousand, six hundred fifty-nine".