21336713 has 2 divisors, whose sum is σ = 21336714. Its totient is φ = 21336712.

The previous prime is 21336697. The next prime is 21336739. The reversal of 21336713 is 31763312.

It is an a-pointer prime, because the next prime (21336739) can be obtained adding 21336713 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21132409 + 204304 = 4597^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 21336713 - 2⁴ = 21336697 is a prime.

It is not a weakly prime, because it can be changed into another prime (21336613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668356 + 10668357.

It is an arithmetic number, because the mean of its divisors is an integer number (10668357).

Almost surely, 2^21336713 is an apocalyptic number.

It is an amenable number.

21336713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336713 is an equidigital number, since it uses as much as digits as its factorization.

21336713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 26.

The square root of 21336713 is about 4619.1679986768. The cubic root of 21336713 is about 277.3591547793.

The spelling of 21336713 in words is "twenty-one million, three hundred thirty-six thousand, seven hundred thirteen".