21853379 has 2 divisors, whose sum is σ = 21853380. Its totient is φ = 21853378.

The previous prime is 21853373. The next prime is 21853387. The reversal of 21853379 is 97335812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21853379 - 2¹² = 21849283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21853373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10926689 + 10926690.

It is an arithmetic number, because the mean of its divisors is an integer number (10926690).

Almost surely, 2^21853379 is an apocalyptic number.

21853379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21853379 is an equidigital number, since it uses as much as digits as its factorization.

21853379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 21853379 is about 4674.7597799245. The cubic root of 21853379 is about 279.5800635327.

The spelling of 21853379 in words is "twenty-one million, eight hundred fifty-three thousand, three hundred seventy-nine".