19180804221 has 12 divisors (see below), whose sum is σ = 27787822972. Its totient is φ = 12749256576.

The previous prime is 19180804187. The next prime is 19180804277. The reversal of 19180804221 is 12240808191.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4571247321 + 14609556900 = 67611^2 + 120870^2 .

It is not a de Polignac number, because 19180804221 - 2⁶ = 19180804157 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 (19180806221) 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, 3158986 + ... + 3165051.

Almost surely, 2^19180804221 is an apocalyptic number.

It is an amenable number.

19180804221 is a deficient number, since it is larger than the sum of its proper divisors (8607018751).

19180804221 is a wasteful number, since it uses less digits than its factorization.

19180804221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6324380 (or 6324377 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 19180804221 in words is "nineteen billion, one hundred eighty million, eight hundred four thousand, two hundred twenty-one".