191226821144 has 16 divisors (see below), whose sum is σ = 359883194400. Its totient is φ = 95257969312.

The previous prime is 191226821141. The next prime is 191226821183. The reversal of 191226821144 is 441128622191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191226821141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44427872 + ... + 44432175.

It is an arithmetic number, because the mean of its divisors is an integer number (22492699650).

Almost surely, 2^191226821144 is an apocalyptic number.

It is an amenable number.

191226821144 is a deficient number, since it is larger than the sum of its proper divisors (168656373256).

191226821144 is a wasteful number, since it uses less digits than its factorization.

191226821144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88860322 (or 88860318 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The spelling of 191226821144 in words is "one hundred ninety-one billion, two hundred twenty-six million, eight hundred twenty-one thousand, one hundred forty-four".