21922744 has 8 divisors (see below), whose sum is σ = 41105160. Its totient is φ = 10961368.

The previous prime is 21922739. The next prime is 21922763. The reversal of 21922744 is 44722912.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1370164 + ... + 1370179.

It is an arithmetic number, because the mean of its divisors is an integer number (5138145).

Almost surely, 2^21922744 is an apocalyptic number.

It is an amenable number.

21922744 is a deficient number, since it is larger than the sum of its proper divisors (19182416).

21922744 is a wasteful number, since it uses less digits than its factorization.

21922744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740349 (or 2740345 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 21922744 is about 4682.1729997940. The cubic root of 21922744 is about 279.8755569457.

The spelling of 21922744 in words is "twenty-one million, nine hundred twenty-two thousand, seven hundred forty-four".