21423292 has 18 divisors (see below), whose sum is σ = 41209784. Its totient is φ = 9737640.

The previous prime is 21423287. The next prime is 21423293. The reversal of 21423292 is 29232412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423293) 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 5 ways as a sum of consecutive naturals, for example, 21648 + ... + 22615.

Almost surely, 2^21423292 is an apocalyptic number.

21423292 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21423292 is a deficient number, since it is larger than the sum of its proper divisors (19786492).

21423292 is a wasteful number, since it uses less digits than its factorization.

21423292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44289 (or 44276 counting only the distinct ones).

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

The square root of 21423292 is about 4628.5302202751. The cubic root of 21423292 is about 277.7337996629.

The spelling of 21423292 in words is "twenty-one million, four hundred twenty-three thousand, two hundred ninety-two".