21865352 has 32 divisors (see below), whose sum is σ = 43629600. Its totient is φ = 10243584.

The previous prime is 21865351. The next prime is 21865357. The reversal of 21865352 is 25356812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21865351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14003 + ... + 15485.

It is an arithmetic number, because the mean of its divisors is an integer number (1363425).

Almost surely, 2^21865352 is an apocalyptic number.

It is an amenable number.

21865352 is a deficient number, since it is larger than the sum of its proper divisors (21764248).

21865352 is a wasteful number, since it uses less digits than its factorization.

21865352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605 (or 1601 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 21865352 is about 4676.0402051308. The cubic root of 21865352 is about 279.6311128610.

The spelling of 21865352 in words is "twenty-one million, eight hundred sixty-five thousand, three hundred fifty-two".