21432292 has 12 divisors (see below), whose sum is σ = 42864640. Its totient is φ = 9185256.

The previous prime is 21432283. The next prime is 21432293. The reversal of 21432292 is 29223412.

21432292 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21432293) 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, 382692 + ... + 382747.

Almost surely, 2^21432292 is an apocalyptic number.

It is an amenable number.

21432292 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21432292 is a wasteful number, since it uses less digits than its factorization.

21432292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765450 (or 765448 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 21432292 is about 4629.5023490652. The cubic root of 21432292 is about 277.7726865319.

The spelling of 21432292 in words is "twenty-one million, four hundred thirty-two thousand, two hundred ninety-two".