21862444 has 6 divisors (see below), whose sum is σ = 38259284. Its totient is φ = 10931220.

The previous prime is 21862441. The next prime is 21862453. The reversal of 21862444 is 44426812.

It is not an unprimeable number, because it can be changed into a prime (21862441) by changing a digit.

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 as a sum of consecutive naturals, namely, 2732802 + ... + 2732809.

Almost surely, 2^21862444 is an apocalyptic number.

It is an amenable number.

21862444 is a deficient number, since it is larger than the sum of its proper divisors (16396840).

21862444 is a wasteful number, since it uses less digits than its factorization.

21862444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5465615 (or 5465613 counting only the distinct ones).

The product of its digits is 12288, while the sum is 31.

The square root of 21862444 is about 4675.7292479356. The cubic root of 21862444 is about 279.6187157235.

The spelling of 21862444 in words is "twenty-one million, eight hundred sixty-two thousand, four hundred forty-four".