21074746 has 16 divisors (see below), whose sum is σ = 39412800. Its totient is φ = 8210880.

The previous prime is 21074737. The next prime is 21074791. The reversal of 21074746 is 64747012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68271 + ... + 68578.

It is an arithmetic number, because the mean of its divisors is an integer number (2463300).

Almost surely, 2^21074746 is an apocalyptic number.

21074746 is a deficient number, since it is larger than the sum of its proper divisors (18338054).

21074746 is a wasteful number, since it uses less digits than its factorization.

21074746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136869.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 21074746 is about 4590.7239080563. The cubic root of 21074746 is about 276.2193610703.

The spelling of 21074746 in words is "twenty-one million, seventy-four thousand, seven hundred forty-six".