21667314 has 16 divisors (see below), whose sum is σ = 43394400. Its totient is φ = 7212480.

The previous prime is 21667309. The next prime is 21667351. The reversal of 21667314 is 41376612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3237 + ... + 7335.

It is an arithmetic number, because the mean of its divisors is an integer number (2712150).

Almost surely, 2^21667314 is an apocalyptic number.

21667314 is an abundant number, since it is smaller than the sum of its proper divisors (21727086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21667314 is a wasteful number, since it uses less digits than its factorization.

21667314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4985.

The product of its digits is 6048, while the sum is 30.

The square root of 21667314 is about 4654.8162154912. The cubic root of 21667314 is about 278.7843299297.

The spelling of 21667314 in words is "twenty-one million, six hundred sixty-seven thousand, three hundred fourteen".