21889152 has 48 divisors (see below), whose sum is σ = 62991630. Its totient is φ = 7296000.

The previous prime is 21889141. The next prime is 21889157. The reversal of 21889152 is 25198812.

It can be written as a sum of positive squares in only one way, i.e., 21013056 + 876096 = 4584^2 + 936^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21889157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8349 + ... + 10652.

Almost surely, 2^21889152 is an apocalyptic number.

It is an amenable number.

21889152 is an abundant number, since it is smaller than the sum of its proper divisors (41102478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21889152 is a wasteful number, since it uses less digits than its factorization.

21889152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19021 (or 19006 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 21889152 is about 4678.5844012906. The cubic root of 21889152 is about 279.7325337034.

The spelling of 21889152 in words is "twenty-one million, eight hundred eighty-nine thousand, one hundred fifty-two".