21284232 has 32 divisors (see below), whose sum is σ = 54345600. Its totient is φ = 6943424.

The previous prime is 21284227. The next prime is 21284243. The reversal of 21284232 is 23248212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8307 + ... + 10562.

It is an arithmetic number, because the mean of its divisors is an integer number (1698300).

Almost surely, 2^21284232 is an apocalyptic number.

It is an amenable number.

21284232 is an abundant number, since it is smaller than the sum of its proper divisors (33061368).

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

21284232 is a wasteful number, since it uses less digits than its factorization.

21284232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18925 (or 18921 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 21284232 is about 4613.4837162387. The cubic root of 21284232 is about 277.1315652647.

The spelling of 21284232 in words is "twenty-one million, two hundred eighty-four thousand, two hundred thirty-two".