21889124 has 12 divisors (see below), whose sum is σ = 38685948. Its totient is φ = 10836000.

The previous prime is 21889099. The next prime is 21889129. The reversal of 21889124 is 42198812.

It can be written as a sum of positive squares in 2 ways, for example, as 9498724 + 12390400 = 3082^2 + 3520^2 .

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 3 ways as a sum of consecutive naturals, for example, 26687 + ... + 27494.

It is an arithmetic number, because the mean of its divisors is an integer number (3223829).

Almost surely, 2^21889124 is an apocalyptic number.

It is an amenable number.

21889124 is a deficient number, since it is larger than the sum of its proper divisors (16796824).

21889124 is a wasteful number, since it uses less digits than its factorization.

21889124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54286 (or 54284 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 21889124 is about 4678.5814089316. The cubic root of 21889124 is about 279.7324144279.

The spelling of 21889124 in words is "twenty-one million, eight hundred eighty-nine thousand, one hundred twenty-four".