21814379 has 2 divisors, whose sum is σ = 21814380. Its totient is φ = 21814378.

The previous prime is 21814369. The next prime is 21814381. The reversal of 21814379 is 97341812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21814379 - 2⁴ = 21814363 is a prime.

It is a Sophie Germain prime.

Together with 21814381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21814319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10907189 + 10907190.

It is an arithmetic number, because the mean of its divisors is an integer number (10907190).

Almost surely, 2^21814379 is an apocalyptic number.

21814379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21814379 is an equidigital number, since it uses as much as digits as its factorization.

21814379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 21814379 is about 4670.5865798634. The cubic root of 21814379 is about 279.4136496767.

The spelling of 21814379 in words is "twenty-one million, eight hundred fourteen thousand, three hundred seventy-nine".