21326614399 has 2 divisors, whose sum is σ = 21326614400. Its totient is φ = 21326614398.

The previous prime is 21326614367. The next prime is 21326614423. The reversal of 21326614399 is 99341662312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21326614399 - 2⁵ = 21326614367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21326611399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10663307199 + 10663307200.

It is an arithmetic number, because the mean of its divisors is an integer number (10663307200).

Almost surely, 2^21326614399 is an apocalyptic number.

21326614399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21326614399 is an equidigital number, since it uses as much as digits as its factorization.

21326614399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 46.

The spelling of 21326614399 in words is "twenty-one billion, three hundred twenty-six million, six hundred fourteen thousand, three hundred ninety-nine".