19121659112 has 8 divisors (see below), whose sum is σ = 35853110850. Its totient is φ = 9560829552.

The previous prime is 19121659093. The next prime is 19121659187. The reversal of 19121659112 is 21195612191.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16758338116 + 2363320996 = 129454^2 + 48614^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1195103687 + ... + 1195103702.

Almost surely, 2^19121659112 is an apocalyptic number.

It is an amenable number.

19121659112 is a deficient number, since it is larger than the sum of its proper divisors (16731451738).

19121659112 is a wasteful number, since it uses less digits than its factorization.

19121659112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390207395 (or 2390207391 counting only the distinct ones).

The product of its digits is 9720, while the sum is 38.

The spelling of 19121659112 in words is "nineteen billion, one hundred twenty-one million, six hundred fifty-nine thousand, one hundred twelve".