21853927 has 2 divisors, whose sum is σ = 21853928. Its totient is φ = 21853926.

The previous prime is 21853913. The next prime is 21853961. The reversal of 21853927 is 72935812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21853927 - 2¹⁹ = 21329639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21853987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10926963 + 10926964.

It is an arithmetic number, because the mean of its divisors is an integer number (10926964).

Almost surely, 2^21853927 is an apocalyptic number.

21853927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21853927 is an equidigital number, since it uses as much as digits as its factorization.

21853927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 21853927 is about 4674.8183921945. The cubic root of 21853927 is about 279.5824004496.

It can be divided in two parts, 218 and 53927, that added together give a palindrome (54145).

The spelling of 21853927 in words is "twenty-one million, eight hundred fifty-three thousand, nine hundred twenty-seven".