21852356 has 24 divisors (see below), whose sum is σ = 40440960. Its totient is φ = 10303200.

The previous prime is 21852353. The next prime is 21852379. The reversal of 21852356 is 65325812.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21852353) 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, 20066 + ... + 21126.

It is an arithmetic number, because the mean of its divisors is an integer number (1685040).

Almost surely, 2^21852356 is an apocalyptic number.

It is an amenable number.

21852356 is a deficient number, since it is larger than the sum of its proper divisors (18588604).

21852356 is a wasteful number, since it uses less digits than its factorization.

21852356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355 (or 1353 counting only the distinct ones).

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

The square root of 21852356 is about 4674.6503612570. The cubic root of 21852356 is about 279.5757008989.

The spelling of 21852356 in words is "twenty-one million, eight hundred fifty-two thousand, three hundred fifty-six".