21696466 has 32 divisors (see below), whose sum is σ = 37946880. Its totient is φ = 9206400.

The previous prime is 21696457. The next prime is 21696487. The reversal of 21696466 is 66469612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19230 + ... + 20326.

It is an arithmetic number, because the mean of its divisors is an integer number (1185840).

Almost surely, 2^21696466 is an apocalyptic number.

21696466 is a deficient number, since it is larger than the sum of its proper divisors (16250414).

21696466 is a wasteful number, since it uses less digits than its factorization.

21696466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170.

The product of its digits is 93312, while the sum is 40.

The square root of 21696466 is about 4657.9465432742. The cubic root of 21696466 is about 278.9093027907.

The spelling of 21696466 in words is "twenty-one million, six hundred ninety-six thousand, four hundred sixty-six".