21402179809999 has 8 divisors (see below), whose sum is σ = 21698383037760. Its totient is φ = 21106608821376.

The previous prime is 21402179809949. The next prime is 21402179810021. The reversal of 21402179809999 is 99990897120412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21402179809999 - 2⁹ = 21402179809487 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 (21402179809949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157991614 + ... + 158127019.

It is an arithmetic number, because the mean of its divisors is an integer number (2712297879720).

Almost surely, 2^{21402179809999} is an apocalyptic number.

21402179809999 is a deficient number, since it is larger than the sum of its proper divisors (296203227761).

21402179809999 is an equidigital number, since it uses as much as digits as its factorization.

21402179809999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316119569.

The product of its (nonzero) digits is 52907904, while the sum is 70.

The spelling of 21402179809999 in words is "twenty-one trillion, four hundred two billion, one hundred seventy-nine million, eight hundred nine thousand, nine hundred ninety-nine".