21498332 has 12 divisors (see below), whose sum is σ = 38639160. Its totient is φ = 10458576.

The previous prime is 21498331. The next prime is 21498341. The reversal of 21498332 is 23389412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21498331) 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, 72482 + ... + 72777.

It is an arithmetic number, because the mean of its divisors is an integer number (3219930).

Almost surely, 2^21498332 is an apocalyptic number.

It is an amenable number.

21498332 is a deficient number, since it is larger than the sum of its proper divisors (17140828).

21498332 is a wasteful number, since it uses less digits than its factorization.

21498332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145300 (or 145298 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 21498332 is about 4636.6293791935. The cubic root of 21498332 is about 278.0576972527.

The spelling of 21498332 in words is "twenty-one million, four hundred ninety-eight thousand, three hundred thirty-two".