19803188121 has 16 divisors (see below), whose sum is σ = 27804522240. Its totient is φ = 12502518480.

The previous prime is 19803188113. The next prime is 19803188129. The reversal of 19803188121 is 12188130891.

It is an interprime number because it is at equal distance from previous prime (19803188113) and next prime (19803188129).

It is not a de Polignac number, because 19803188121 - 2³ = 19803188113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19803188129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88186 + ... + 217676.

It is an arithmetic number, because the mean of its divisors is an integer number (1737782640).

Almost surely, 2^19803188121 is an apocalyptic number.

It is an amenable number.

19803188121 is a deficient number, since it is larger than the sum of its proper divisors (8001334119).

19803188121 is a wasteful number, since it uses less digits than its factorization.

19803188121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132196.

The product of its (nonzero) digits is 27648, while the sum is 42.

The spelling of 19803188121 in words is "nineteen billion, eight hundred three million, one hundred eighty-eight thousand, one hundred twenty-one".