21774856 has 16 divisors (see below), whose sum is σ = 41778000. Its totient is φ = 10634064.

The previous prime is 21774847. The next prime is 21774871. The reversal of 21774856 is 65847712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31306 + ... + 31993.

It is an arithmetic number, because the mean of its divisors is an integer number (2611125).

Almost surely, 2^21774856 is an apocalyptic number.

It is an amenable number.

21774856 is a deficient number, since it is larger than the sum of its proper divisors (20003144).

21774856 is a wasteful number, since it uses less digits than its factorization.

21774856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63348 (or 63344 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 21774856 is about 4666.3536085470. The cubic root of 21774856 is about 279.2448016928.

The spelling of 21774856 in words is "twenty-one million, seven hundred seventy-four thousand, eight hundred fifty-six".