18132595221 has 16 divisors (see below), whose sum is σ = 26076093120. Its totient is φ = 11141571840.

The previous prime is 18132595219. The next prime is 18132595279. The reversal of 18132595221 is 12259523181.

It is a happy number.

It is not a de Polignac number, because 18132595221 - 2¹ = 18132595219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 18132595221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18132595121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327060 + ... + 378461.

It is an arithmetic number, because the mean of its divisors is an integer number (1629755820).

Almost surely, 2^18132595221 is an apocalyptic number.

It is an amenable number.

18132595221 is a deficient number, since it is larger than the sum of its proper divisors (7943497899).

18132595221 is a wasteful number, since it uses less digits than its factorization.

18132595221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706196.

The product of its digits is 43200, while the sum is 39.

The spelling of 18132595221 in words is "eighteen billion, one hundred thirty-two million, five hundred ninety-five thousand, two hundred twenty-one".