21336716 has 12 divisors (see below), whose sum is σ = 38348688. Its totient is φ = 10379952.

The previous prime is 21336713. The next prime is 21336739. The reversal of 21336716 is 61763312.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71936 + ... + 72231.

It is an arithmetic number, because the mean of its divisors is an integer number (3195724).

Almost surely, 2^21336716 is an apocalyptic number.

It is an amenable number.

21336716 is a deficient number, since it is larger than the sum of its proper divisors (17011972).

21336716 is a wasteful number, since it uses less digits than its factorization.

21336716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144208 (or 144206 counting only the distinct ones).

The product of its digits is 4536, while the sum is 29.

The square root of 21336716 is about 4619.1683234106. The cubic root of 21336716 is about 277.3591677785.

The spelling of 21336716 in words is "twenty-one million, three hundred thirty-six thousand, seven hundred sixteen".