19165332221 has 12 divisors (see below), whose sum is σ = 22296980700. Its totient is φ = 16425501120.

The previous prime is 19165332217. The next prime is 19165332229. The reversal of 19165332221 is 12223356191.

It can be written as a sum of positive squares in 2 ways, for example, as 10406244121 + 8759088100 = 102011^2 + 93590^2 .

It is not a de Polignac number, because 19165332221 - 2² = 19165332217 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 (19165332229) 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, 537455 + ... + 572003.

It is an arithmetic number, because the mean of its divisors is an integer number (1858081725).

Almost surely, 2^19165332221 is an apocalyptic number.

It is an amenable number.

19165332221 is a deficient number, since it is larger than the sum of its proper divisors (3131648479).

19165332221 is a wasteful number, since it uses less digits than its factorization.

19165332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45884 (or 45877 counting only the distinct ones).

The product of its digits is 19440, while the sum is 35.

The spelling of 19165332221 in words is "nineteen billion, one hundred sixty-five million, three hundred thirty-two thousand, two hundred twenty-one".