21889232 has 10 divisors (see below), whose sum is σ = 42410418. Its totient is φ = 10944608.

The previous prime is 21889223. The next prime is 21889247. The reversal of 21889232 is 23298812.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 1132096 = 4556^2 + 1064^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21889192 and 21889201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684023 + ... + 684054.

Almost surely, 2^21889232 is an apocalyptic number.

It is an amenable number.

21889232 is a deficient number, since it is larger than the sum of its proper divisors (20521186).

21889232 is a wasteful number, since it uses less digits than its factorization.

21889232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368085 (or 1368079 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 21889232 is about 4678.5929508774. The cubic root of 21889232 is about 279.7328744897.

The spelling of 21889232 in words is "twenty-one million, eight hundred eighty-nine thousand, two hundred thirty-two".