22821644 has 12 divisors (see below), whose sum is σ = 39979968. Its totient is φ = 11398800.

The previous prime is 22821587. The next prime is 22821653. The reversal of 22821644 is 44612822.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2309 + ... + 7139.

It is an arithmetic number, because the mean of its divisors is an integer number (3331664).

Almost surely, 2^22821644 is an apocalyptic number.

It is an amenable number.

22821644 is a deficient number, since it is larger than the sum of its proper divisors (17158324).

22821644 is a wasteful number, since it uses less digits than its factorization.

22821644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6016 (or 6014 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

The square root of 22821644 is about 4777.2004354015. The cubic root of 22821644 is about 283.6496870920.

The spelling of 22821644 in words is "twenty-two million, eight hundred twenty-one thousand, six hundred forty-four".