21334404379 has 2 divisors, whose sum is σ = 21334404380. Its totient is φ = 21334404378.

The previous prime is 21334404367. The next prime is 21334404433. The reversal of 21334404379 is 97340443312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21334404379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21334402379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667202189 + 10667202190.

It is an arithmetic number, because the mean of its divisors is an integer number (10667202190).

Almost surely, 2^21334404379 is an apocalyptic number.

21334404379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334404379 is an equidigital number, since it uses as much as digits as its factorization.

21334404379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 40.

The spelling of 21334404379 in words is "twenty-one billion, three hundred thirty-four million, four hundred four thousand, three hundred seventy-nine".