19329121917 has 24 divisors (see below), whose sum is σ = 31918723200. Its totient is φ = 11041636320.

The previous prime is 19329121913. The next prime is 19329121939. The reversal of 19329121917 is 71912192391.

It is a happy number.

It is not a de Polignac number, because 19329121917 - 2² = 19329121913 is a prime.

It is a super-2 number, since 2×19329121917² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19329121913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152959 + ... + 249107.

It is an arithmetic number, because the mean of its divisors is an integer number (1329946800).

Almost surely, 2^19329121917 is an apocalyptic number.

It is an amenable number.

19329121917 is a deficient number, since it is larger than the sum of its proper divisors (12589601283).

19329121917 is a wasteful number, since it uses less digits than its factorization.

19329121917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99353 (or 99350 counting only the distinct ones).

The product of its digits is 61236, while the sum is 45.

It can be divided in two parts, 19329 and 121917, that added together give a triangular number (141246 = T₅₃₁).

The spelling of 19329121917 in words is "nineteen billion, three hundred twenty-nine million, one hundred twenty-one thousand, nine hundred seventeen".