21336916 has 12 divisors (see below), whose sum is σ = 38963232. Its totient is φ = 10204568.

The previous prime is 21336907. The next prime is 21336961. The reversal of 21336916 is 61963312.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 115870 + ... + 116053.

It is an arithmetic number, because the mean of its divisors is an integer number (3246936).

Almost surely, 2^21336916 is an apocalyptic number.

It is an amenable number.

21336916 is a deficient number, since it is larger than the sum of its proper divisors (17626316).

21336916 is a wasteful number, since it uses less digits than its factorization.

21336916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231950 (or 231948 counting only the distinct ones).

The product of its digits is 5832, while the sum is 31.

The square root of 21336916 is about 4619.1899722787. The cubic root of 21336916 is about 277.3600343858.

The spelling of 21336916 in words is "twenty-one million, three hundred thirty-six thousand, nine hundred sixteen".