21852911 has 2 divisors, whose sum is σ = 21852912. Its totient is φ = 21852910.

The previous prime is 21852899. The next prime is 21852913. The reversal of 21852911 is 11925812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21852911 - 2¹⁰ = 21851887 is a prime.

Together with 21852913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21852913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10926455 + 10926456.

It is an arithmetic number, because the mean of its divisors is an integer number (10926456).

Almost surely, 2^21852911 is an apocalyptic number.

21852911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21852911 is an equidigital number, since it uses as much as digits as its factorization.

21852911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 29.

The square root of 21852911 is about 4674.7097236085. The cubic root of 21852911 is about 279.5780677405.

The spelling of 21852911 in words is "twenty-one million, eight hundred fifty-two thousand, nine hundred eleven".