21408881260799 has 16 divisors (see below), whose sum is σ = 22340897280000. Its totient is φ = 20493116787360.

The previous prime is 21408881260777. The next prime is 21408881260841. The reversal of 21408881260799 is 99706218880412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21408881260799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21408881260499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8592629 + ... + 10800510.

It is an arithmetic number, because the mean of its divisors is an integer number (1396306080000).

Almost surely, 2^{21408881260799} is an apocalyptic number.

21408881260799 is a deficient number, since it is larger than the sum of its proper divisors (932016019201).

21408881260799 is a wasteful number, since it uses less digits than its factorization.

21408881260799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19393558.

The product of its (nonzero) digits is 27869184, while the sum is 65.

The spelling of 21408881260799 in words is "twenty-one trillion, four hundred eight billion, eight hundred eighty-one million, two hundred sixty thousand, seven hundred ninety-nine".