21392852 has 48 divisors (see below), whose sum is σ = 43502592. Its totient is φ = 9123840.

The previous prime is 21392843. The next prime is 21392863. The reversal of 21392852 is 25829312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 36788 + ... + 37364.

It is an arithmetic number, because the mean of its divisors is an integer number (906304).

Almost surely, 2^21392852 is an apocalyptic number.

It is an amenable number.

21392852 is an abundant number, since it is smaller than the sum of its proper divisors (22109740).

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

21392852 is a wasteful number, since it uses less digits than its factorization.

21392852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 646 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 21392852 is about 4625.2407504907. The cubic root of 21392852 is about 277.6021948629.

The spelling of 21392852 in words is "twenty-one million, three hundred ninety-two thousand, eight hundred fifty-two".