21774444 has 24 divisors (see below), whose sum is σ = 52047408. Its totient is φ = 7080960.

The previous prime is 21774443. The next prime is 21774449. The reversal of 21774444 is 44447712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21774443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21637 + ... + 22620.

It is an arithmetic number, because the mean of its divisors is an integer number (2168642).

Almost surely, 2^21774444 is an apocalyptic number.

It is an amenable number.

21774444 is an abundant number, since it is smaller than the sum of its proper divisors (30272964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21774444 is a wasteful number, since it uses less digits than its factorization.

21774444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44305 (or 44303 counting only the distinct ones).

The product of its digits is 25088, while the sum is 33.

The square root of 21774444 is about 4666.3094625196. The cubic root of 21774444 is about 279.2430404935.

The spelling of 21774444 in words is "twenty-one million, seven hundred seventy-four thousand, four hundred forty-four".