21852539 has 2 divisors, whose sum is σ = 21852540. Its totient is φ = 21852538.

The previous prime is 21852529. The next prime is 21852547. The reversal of 21852539 is 93525812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21852539 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21852499 and 21852508.

It is not a weakly prime, because it can be changed into another prime (21852529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10926269 + 10926270.

It is an arithmetic number, because the mean of its divisors is an integer number (10926270).

Almost surely, 2^21852539 is an apocalyptic number.

21852539 is a deficient number, since it is larger than the sum of its proper divisors (1).

21852539 is an equidigital number, since it uses as much as digits as its factorization.

21852539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The square root of 21852539 is about 4674.6699348724. The cubic root of 21852539 is about 279.5764813214.

The spelling of 21852539 in words is "twenty-one million, eight hundred fifty-two thousand, five hundred thirty-nine".