21889179 has 24 divisors (see below), whose sum is σ = 34619312. Its totient is φ = 13245120.

The previous prime is 21889157. The next prime is 21889187. The reversal of 21889179 is 97198812.

It is not a de Polignac number, because 21889179 - 2⁹ = 21888667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21889129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5604 + ... + 8670.

Almost surely, 2^21889179 is an apocalyptic number.

21889179 is a deficient number, since it is larger than the sum of its proper divisors (12730133).

21889179 is a wasteful number, since it uses less digits than its factorization.

21889179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3147 (or 3144 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 21889179 is about 4678.5872867779. The cubic root of 21889179 is about 279.7326487189.

The spelling of 21889179 in words is "twenty-one million, eight hundred eighty-nine thousand, one hundred seventy-nine".