21336715 has 16 divisors (see below), whose sum is σ = 27302400. Its totient is φ = 15960672.

The previous prime is 21336713. The next prime is 21336739. The reversal of 21336715 is 51763312.

It is a cyclic number.

It is not a de Polignac number, because 21336715 - 2¹ = 21336713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21336713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6084 + ... + 8926.

It is an arithmetic number, because the mean of its divisors is an integer number (1706400).

Almost surely, 2^21336715 is an apocalyptic number.

21336715 is a deficient number, since it is larger than the sum of its proper divisors (5965685).

21336715 is a wasteful number, since it uses less digits than its factorization.

21336715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946.

The product of its digits is 3780, while the sum is 28.

The square root of 21336715 is about 4619.1682151660. The cubic root of 21336715 is about 277.3591634454.

The spelling of 21336715 in words is "twenty-one million, three hundred thirty-six thousand, seven hundred fifteen".