21444014399 has 2 divisors, whose sum is σ = 21444014400. Its totient is φ = 21444014398.

The previous prime is 21444014363. The next prime is 21444014497. The reversal of 21444014399 is 99341044412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21444014399 - 2²⁰ = 21442965823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444014329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722007199 + 10722007200.

It is an arithmetic number, because the mean of its divisors is an integer number (10722007200).

Almost surely, 2^21444014399 is an apocalyptic number.

21444014399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444014399 is an equidigital number, since it uses as much as digits as its factorization.

21444014399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21444014399 in words is "twenty-one billion, four hundred forty-four million, fourteen thousand, three hundred ninety-nine".