18221635489039 has 4 divisors (see below), whose sum is σ = 18666065622960. Its totient is φ = 17777205355120.

The previous prime is 18221635489027. The next prime is 18221635489051. The reversal of 18221635489039 is 93098453612281.

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

It is an interprime number because it is at equal distance from previous prime (18221635489027) and next prime (18221635489051).

It is a cyclic number.

It is not a de Polignac number, because 18221635489039 - 2⁵ = 18221635489007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18221635489009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222215066899 + ... + 222215066980.

It is an arithmetic number, because the mean of its divisors is an integer number (4666516405740).

Almost surely, 2^{18221635489039} is an apocalyptic number.

18221635489039 is a deficient number, since it is larger than the sum of its proper divisors (444430133921).

18221635489039 is an equidigital number, since it uses as much as digits as its factorization.

18221635489039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444430133920.

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 18221635489039 in words is "eighteen trillion, two hundred twenty-one billion, six hundred thirty-five million, four hundred eighty-nine thousand, thirty-nine".