21149232 has 40 divisors (see below), whose sum is σ = 58839984. Its totient is φ = 6507264.

The previous prime is 21149231. The next prime is 21149243. The reversal of 21149232 is 23294112.

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

It is not an unprimeable number, because it can be changed into a prime (21149231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16323 + ... + 17570.

Almost surely, 2^21149232 is an apocalyptic number.

It is an amenable number.

21149232 is an abundant number, since it is smaller than the sum of its proper divisors (37690752).

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

21149232 is a wasteful number, since it uses less digits than its factorization.

21149232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33917 (or 33911 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 21149232 is about 4598.8294162754. The cubic root of 21149232 is about 276.5443991281.

The spelling of 21149232 in words is "twenty-one million, one hundred forty-nine thousand, two hundred thirty-two".