21889441 has 16 divisors (see below), whose sum is σ = 26035200. Its totient is φ = 18008640.

The previous prime is 21889429. The next prime is 21889447. The reversal of 21889441 is 14498812.

It is a cyclic number.

It is not a de Polignac number, because 21889441 - 2⁷ = 21889313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21889441.

It is not an unprimeable number, because it can be changed into a prime (21889447) 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, 31995 + ... + 32671.

It is an arithmetic number, because the mean of its divisors is an integer number (1627200).

Almost surely, 2^21889441 is an apocalyptic number.

It is an amenable number.

21889441 is a deficient number, since it is larger than the sum of its proper divisors (4145759).

21889441 is a wasteful number, since it uses less digits than its factorization.

21889441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864.

The product of its digits is 18432, while the sum is 37.

The square root of 21889441 is about 4678.6152865992. The cubic root of 21889441 is about 279.7337647903.

The spelling of 21889441 in words is "twenty-one million, eight hundred eighty-nine thousand, four hundred forty-one".