21493466 has 16 divisors (see below), whose sum is σ = 33855840. Its totient is φ = 10219440.

The previous prime is 21493453. The next prime is 21493481. The reversal of 21493466 is 66439412.

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, 1121 + ... + 6651.

It is an arithmetic number, because the mean of its divisors is an integer number (2115990).

Almost surely, 2^21493466 is an apocalyptic number.

21493466 is a deficient number, since it is larger than the sum of its proper divisors (12362374).

21493466 is a wasteful number, since it uses less digits than its factorization.

21493466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5629.

The product of its digits is 31104, while the sum is 35.

The square root of 21493466 is about 4636.1046148680. The cubic root of 21493466 is about 278.0367168522.

The spelling of 21493466 in words is "twenty-one million, four hundred ninety-three thousand, four hundred sixty-six".