21056194 has 8 divisors (see below), whose sum is σ = 31864140. Its totient is φ = 10434816.

The previous prime is 21056179. The next prime is 21056227. The reversal of 21056194 is 49165012.

It can be written as a sum of positive squares in 2 ways, for example, as 21040569 + 15625 = 4587^2 + 125^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 46359 + ... + 46810.

Almost surely, 2^21056194 is an apocalyptic number.

21056194 is a deficient number, since it is larger than the sum of its proper divisors (10807946).

21056194 is a wasteful number, since it uses less digits than its factorization.

21056194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93284.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21056194 is about 4588.7028668241. The cubic root of 21056194 is about 276.1382857398.

The spelling of 21056194 in words is "twenty-one million, fifty-six thousand, one hundred ninety-four".