21844774 has 32 divisors (see below), whose sum is σ = 38750976. Its totient is φ = 9041760.

The previous prime is 21844751. The next prime is 21844777. The reversal of 21844774 is 47744812.

It is a super-2 number, since 2×21844774² = 954388302222152, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21844777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78724 + ... + 79000.

It is an arithmetic number, because the mean of its divisors is an integer number (1210968).

Almost surely, 2^21844774 is an apocalyptic number.

21844774 is a deficient number, since it is larger than the sum of its proper divisors (16906202).

21844774 is a wasteful number, since it uses less digits than its factorization.

21844774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460.

The product of its digits is 50176, while the sum is 37.

The square root of 21844774 is about 4673.8393211577. The cubic root of 21844774 is about 279.5433628424.

The spelling of 21844774 in words is "twenty-one million, eight hundred forty-four thousand, seven hundred seventy-four".