21889169 has 8 divisors (see below), whose sum is σ = 23328000. Its totient is φ = 20490976.

The previous prime is 21889157. The next prime is 21889187. The reversal of 21889169 is 96198812.

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

It is not a de Polignac number, because 21889169 - 2⁸ = 21888913 is a prime.

It is a super-2 number, since 2×21889169² = 958271439021122, which contains 22 as substring.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 9044 + ... + 11205.

It is an arithmetic number, because the mean of its divisors is an integer number (2916000).

Almost surely, 2^21889169 is an apocalyptic number.

It is an amenable number.

21889169 is a deficient number, since it is larger than the sum of its proper divisors (1438831).

21889169 is a wasteful number, since it uses less digits than its factorization.

21889169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20319.

The product of its digits is 62208, while the sum is 44.

The square root of 21889169 is about 4678.5862180791. The cubic root of 21889169 is about 279.7326061205.

The spelling of 21889169 in words is "twenty-one million, eight hundred eighty-nine thousand, one hundred sixty-nine".