19121350121 has 4 divisors (see below), whose sum is σ = 19121651712. Its totient is φ = 19121048532.

The previous prime is 19121350103. The next prime is 19121350133. The reversal of 19121350121 is 12105312191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19121350121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19121350621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14825 + ... + 196118.

It is an arithmetic number, because the mean of its divisors is an integer number (4780412928).

Almost surely, 2^19121350121 is an apocalyptic number.

It is an amenable number.

19121350121 is a deficient number, since it is larger than the sum of its proper divisors (301591).

19121350121 is an equidigital number, since it uses as much as digits as its factorization.

19121350121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301590.

The product of its (nonzero) digits is 540, while the sum is 26.

The spelling of 19121350121 in words is "nineteen billion, one hundred twenty-one million, three hundred fifty thousand, one hundred twenty-one".