21488332 has 12 divisors (see below), whose sum is σ = 38817856. Its totient is φ = 10397520.

The previous prime is 21488329. The next prime is 21488339. The reversal of 21488332 is 23388412.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 21488294 and 21488303.

It is not an unprimeable number, because it can be changed into a prime (21488339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86523 + ... + 86770.

Almost surely, 2^21488332 is an apocalyptic number.

It is an amenable number.

21488332 is a deficient number, since it is larger than the sum of its proper divisors (17329524).

21488332 is a wasteful number, since it uses less digits than its factorization.

21488332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173328 (or 173326 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 21488332 is about 4635.5508841992. The cubic root of 21488332 is about 278.0145775010.

The spelling of 21488332 in words is "twenty-one million, four hundred eighty-eight thousand, three hundred thirty-two".