21294668 has 18 divisors (see below), whose sum is σ = 39332916. Its totient is φ = 10086264.

The previous prime is 21294653. The next prime is 21294709. The reversal of 21294668 is 86649212.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5930 + ... + 8817.

It is an arithmetic number, because the mean of its divisors is an integer number (2185162).

Almost surely, 2^21294668 is an apocalyptic number.

It is an amenable number.

21294668 is a deficient number, since it is larger than the sum of its proper divisors (18038248).

21294668 is a wasteful number, since it uses less digits than its factorization.

21294668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14789 (or 14768 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 21294668 is about 4614.6146101273. The cubic root of 21294668 is about 277.1768518797.

The spelling of 21294668 in words is "twenty-one million, two hundred ninety-four thousand, six hundred sixty-eight".