182138195221 has 12 divisors (see below), whose sum is σ = 184604178220. Its totient is φ = 179704535040.

The previous prime is 182138195117. The next prime is 182138195237. The reversal of 182138195221 is 122591831281.

It can be written as a sum of positive squares in 2 ways, for example, as 41081614596 + 141056580625 = 202686^2 + 375575^2 .

It is not a de Polignac number, because 182138195221 - 2¹¹ = 182138193173 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 (182138195321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5280451 + ... + 5314831.

Almost surely, 2^182138195221 is an apocalyptic number.

It is an amenable number.

182138195221 is a deficient number, since it is larger than the sum of its proper divisors (2465982999).

182138195221 is an frugal number, since it uses more digits than its factorization.

182138195221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35316 (or 35233 counting only the distinct ones).

The product of its digits is 69120, while the sum is 43.

The spelling of 182138195221 in words is "one hundred eighty-two billion, one hundred thirty-eight million, one hundred ninety-five thousand, two hundred twenty-one".