21892189 has 16 divisors (see below), whose sum is σ = 24508800. Its totient is φ = 19388160.

The previous prime is 21892153. The next prime is 21892201. The reversal of 21892189 is 98129812.

It is not a de Polignac number, because 21892189 - 2⁹ = 21891677 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21892109) 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, 109912 + ... + 110110.

It is an arithmetic number, because the mean of its divisors is an integer number (1531800).

Almost surely, 2^21892189 is an apocalyptic number.

It is an amenable number.

21892189 is a deficient number, since it is larger than the sum of its proper divisors (2616611).

21892189 is a wasteful number, since it uses less digits than its factorization.

21892189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its digits is 20736, while the sum is 40.

The square root of 21892189 is about 4678.9089540191. The cubic root of 21892189 is about 279.7454702243.

The spelling of 21892189 in words is "twenty-one million, eight hundred ninety-two thousand, one hundred eighty-nine".