21797739899 has 8 divisors (see below), whose sum is σ = 23495671920. Its totient is φ = 20102834016.

The previous prime is 21797739877. The next prime is 21797739919. The reversal of 21797739899 is 99893779712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21797739899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21797739809) 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, 741557 + ... + 770390.

It is an arithmetic number, because the mean of its divisors is an integer number (2936958990).

Almost surely, 2^21797739899 is an apocalyptic number.

21797739899 is a deficient number, since it is larger than the sum of its proper divisors (1697932021).

21797739899 is a wasteful number, since it uses less digits than its factorization.

21797739899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513069.

The product of its digits is 108020304, while the sum is 71.

The spelling of 21797739899 in words is "twenty-one billion, seven hundred ninety-seven million, seven hundred thirty-nine thousand, eight hundred ninety-nine".