21694592 has 16 divisors (see below), whose sum is σ = 43219950. Its totient is φ = 10847232.

The previous prime is 21694583. The next prime is 21694609. The reversal of 21694592 is 29549612.

It can be written as a sum of positive squares in only one way, i.e., 13719616 + 7974976 = 3704^2 + 2824^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84617 + ... + 84872.

Almost surely, 2^21694592 is an apocalyptic number.

It is an amenable number.

21694592 is a deficient number, since it is larger than the sum of its proper divisors (21525358).

21694592 is an equidigital number, since it uses as much as digits as its factorization.

21694592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169503 (or 169491 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 21694592 is about 4657.7453773258. The cubic root of 21694592 is about 278.9012724340.

The spelling of 21694592 in words is "twenty-one million, six hundred ninety-four thousand, five hundred ninety-two".