21313379 has 2 divisors, whose sum is σ = 21313380. Its totient is φ = 21313378.

The previous prime is 21313373. The next prime is 21313429. The reversal of 21313379 is 97331312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21313379 - 2⁴ = 21313363 is a prime.

It is a Chen prime.

It is equal to p_1348526 and since 21313379 and 1348526 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21313373) 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, 10656689 + 10656690.

It is an arithmetic number, because the mean of its divisors is an integer number (10656690).

Almost surely, 2^21313379 is an apocalyptic number.

21313379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313379 is an equidigital number, since it uses as much as digits as its factorization.

21313379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 29.

The square root of 21313379 is about 4616.6415282107. The cubic root of 21313379 is about 277.2580105029.

The spelling of 21313379 in words is "twenty-one million, three hundred thirteen thousand, three hundred seventy-nine".