21283392 has 56 divisors (see below), whose sum is σ = 60651136. Its totient is φ = 6547968.

The previous prime is 21283351. The next prime is 21283397. The reversal of 21283392 is 29338212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21283397) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1768 + ... + 6759.

It is an arithmetic number, because the mean of its divisors is an integer number (1083056).

Almost surely, 2^21283392 is an apocalyptic number.

It is an amenable number.

21283392 is an abundant number, since it is smaller than the sum of its proper divisors (39367744).

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

21283392 is a wasteful number, since it uses less digits than its factorization.

21283392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8555 (or 8545 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 21283392 is about 4613.3926778457. The cubic root of 21283392 is about 277.1279194739.

The spelling of 21283392 in words is "twenty-one million, two hundred eighty-three thousand, three hundred ninety-two".