21393852 has 24 divisors (see below), whose sum is σ = 50034432. Its totient is φ = 7114800.

The previous prime is 21393847. The next prime is 21393899. The reversal of 21393852 is 25839312.

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 7 ways as a sum of consecutive naturals, for example, 4077 + ... + 7707.

It is an arithmetic number, because the mean of its divisors is an integer number (2084768).

Almost surely, 2^21393852 is an apocalyptic number.

It is an amenable number.

21393852 is an abundant number, since it is smaller than the sum of its proper divisors (28640580).

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

21393852 is a wasteful number, since it uses less digits than its factorization.

21393852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4129 (or 4127 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 21393852 is about 4625.3488517084. The cubic root of 21393852 is about 277.6065202620.

The spelling of 21393852 in words is "twenty-one million, three hundred ninety-three thousand, eight hundred fifty-two".