13621607999 has 4 divisors (see below), whose sum is σ = 13626815664. Its totient is φ = 13616400336.

The previous prime is 13621607977. The next prime is 13621608017. The reversal of 13621607999 is 99970612631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13621607999 - 2¹² = 13621603903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13621607999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13621607099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2599907 + ... + 2605140.

It is an arithmetic number, because the mean of its divisors is an integer number (3406703916).

Almost surely, 2^13621607999 is an apocalyptic number.

13621607999 is a deficient number, since it is larger than the sum of its proper divisors (5207665).

13621607999 is an equidigital number, since it uses as much as digits as its factorization.

13621607999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5207664.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The spelling of 13621607999 in words is "thirteen billion, six hundred twenty-one million, six hundred seven thousand, nine hundred ninety-nine".