21144373899 has 8 divisors (see below), whose sum is σ = 30755452992. Its totient is φ = 12814772040.

The previous prime is 21144373879. The next prime is 21144373967. The reversal of 21144373899 is 99837344112.

It is a happy number.

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

It is not a de Polignac number, because 21144373899 - 2⁵ = 21144373867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21144373879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320369269 + ... + 320369334.

It is an arithmetic number, because the mean of its divisors is an integer number (3844431624).

Almost surely, 2^21144373899 is an apocalyptic number.

21144373899 is a deficient number, since it is larger than the sum of its proper divisors (9611079093).

21144373899 is a wasteful number, since it uses less digits than its factorization.

21144373899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640738617.

The product of its digits is 1306368, while the sum is 51.

The spelling of 21144373899 in words is "twenty-one billion, one hundred forty-four million, three hundred seventy-three thousand, eight hundred ninety-nine".