21444503199 has 8 divisors (see below), whose sum is σ = 32677338240. Its totient is φ = 12254001816.

The previous prime is 21444503191. The next prime is 21444503207. The reversal of 21444503199 is 99130544412.

It is an interprime number because it is at equal distance from previous prime (21444503191) and next prime (21444503207).

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

It is not a de Polignac number, because 21444503199 - 2³ = 21444503191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21444503199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444503191) 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, 510583389 + ... + 510583430.

It is an arithmetic number, because the mean of its divisors is an integer number (4084667280).

Almost surely, 2^21444503199 is an apocalyptic number.

21444503199 is a deficient number, since it is larger than the sum of its proper divisors (11232835041).

21444503199 is a wasteful number, since it uses less digits than its factorization.

21444503199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021166829.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 21444503199 in words is "twenty-one billion, four hundred forty-four million, five hundred three thousand, one hundred ninety-nine".