21856174 has 4 divisors (see below), whose sum is σ = 32784264. Its totient is φ = 10928086.

The previous prime is 21856151. The next prime is 21856189. The reversal of 21856174 is 47165812.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5464042 + ... + 5464045.

It is an arithmetic number, because the mean of its divisors is an integer number (8196066).

Almost surely, 2^21856174 is an apocalyptic number.

21856174 is a deficient number, since it is larger than the sum of its proper divisors (10928090).

21856174 is a wasteful number, since it uses less digits than its factorization.

21856174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10928089.

The product of its digits is 13440, while the sum is 34.

The square root of 21856174 is about 4675.0587162088. The cubic root of 21856174 is about 279.5919822534.

The spelling of 21856174 in words is "twenty-one million, eight hundred fifty-six thousand, one hundred seventy-four".