21373379 has 2 divisors, whose sum is σ = 21373380. Its totient is φ = 21373378.

The previous prime is 21373361. The next prime is 21373393. The reversal of 21373379 is 97337312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21373379 - 2⁸ = 21373123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21373349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686689 + 10686690.

It is an arithmetic number, because the mean of its divisors is an integer number (10686690).

Almost surely, 2^21373379 is an apocalyptic number.

21373379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21373379 is an equidigital number, since it uses as much as digits as its factorization.

21373379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 35.

The square root of 21373379 is about 4623.1351916205. The cubic root of 21373379 is about 277.5179394836.

The spelling of 21373379 in words is "twenty-one million, three hundred seventy-three thousand, three hundred seventy-nine".