21079546 has 16 divisors (see below), whose sum is σ = 33764544. Its totient is φ = 9846144.

The previous prime is 21079537. The next prime is 21079567. The reversal of 21079546 is 64597012.

It is a super-2 number, since 2×21079546² = 888694519132232, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 3351 + ... + 7306.

It is an arithmetic number, because the mean of its divisors is an integer number (2110284).

Almost surely, 2^21079546 is an apocalyptic number.

21079546 is a deficient number, since it is larger than the sum of its proper divisors (12684998).

21079546 is a wasteful number, since it uses less digits than its factorization.

21079546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10725.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21079546 is about 4591.2466716568. The cubic root of 21079546 is about 276.2403301216.

The spelling of 21079546 in words is "twenty-one million, seventy-nine thousand, five hundred forty-six".