21238292 has 18 divisors (see below), whose sum is σ = 38857098. Its totient is φ = 10156432.

The previous prime is 21238277. The next prime is 21238303. The reversal of 21238292 is 29283212.

It can be written as a sum of positive squares in only one way, i.e., 16760836 + 4477456 = 4094^2 + 2116^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2903 + ... + 7134.

Almost surely, 2^21238292 is an apocalyptic number.

It is an amenable number.

21238292 is a deficient number, since it is larger than the sum of its proper divisors (17618806).

21238292 is a wasteful number, since it uses less digits than its factorization.

21238292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10087 (or 10062 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21238292 is about 4608.5021427791. The cubic root of 21238292 is about 276.9320342228.

The spelling of 21238292 in words is "twenty-one million, two hundred thirty-eight thousand, two hundred ninety-two".