21192746 has 4 divisors (see below), whose sum is σ = 31789122. Its totient is φ = 10596372.

The previous prime is 21192737. The next prime is 21192763. The reversal of 21192746 is 64729112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 3845521 = 4165^2 + 1961^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5298185 + ... + 5298188.

Almost surely, 2^21192746 is an apocalyptic number.

21192746 is a deficient number, since it is larger than the sum of its proper divisors (10596376).

21192746 is a wasteful number, since it uses less digits than its factorization.

21192746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10596375.

The product of its digits is 6048, while the sum is 32.

The square root of 21192746 is about 4603.5579718300. The cubic root of 21192746 is about 276.7339301947.

The spelling of 21192746 in words is "twenty-one million, one hundred ninety-two thousand, seven hundred forty-six".