21889361 has 8 divisors (see below), whose sum is σ = 23649024. Its totient is φ = 20140560.

The previous prime is 21889333. The next prime is 21889363. The reversal of 21889361 is 16398812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21889361 - 2⁶ = 21889297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21889363) 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, 1760 + ... + 6846.

It is an arithmetic number, because the mean of its divisors is an integer number (2956128).

Almost surely, 2^21889361 is an apocalyptic number.

It is an amenable number.

21889361 is a deficient number, since it is larger than the sum of its proper divisors (1759663).

21889361 is a wasteful number, since it uses less digits than its factorization.

21889361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431.

The product of its digits is 20736, while the sum is 38.

The square root of 21889361 is about 4678.6067370532. The cubic root of 21889361 is about 279.7334240061.

The spelling of 21889361 in words is "twenty-one million, eight hundred eighty-nine thousand, three hundred sixty-one".