21094564 has 12 divisors (see below), whose sum is σ = 37078300. Its totient is φ = 10500768.

The previous prime is 21094559. The next prime is 21094589. The reversal of 21094564 is 46549012.

It can be written as a sum of positive squares in 2 ways, for example, as 19430464 + 1664100 = 4408^2 + 1290^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10599 + ... + 12430.

Almost surely, 2^21094564 is an apocalyptic number.

It is an amenable number.

21094564 is a deficient number, since it is larger than the sum of its proper divisors (15983736).

21094564 is a wasteful number, since it uses less digits than its factorization.

21094564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23262 (or 23260 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21094564 is about 4592.8818839591. The cubic root of 21094564 is about 276.3059164876.

The spelling of 21094564 in words is "twenty-one million, ninety-four thousand, five hundred sixty-four".