19121838719 has 4 divisors (see below), whose sum is σ = 19122311880. Its totient is φ = 19121365560.

The previous prime is 19121838713. The next prime is 19121838737. The reversal of 19121838719 is 91783812191.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19121838719 - 2¹² = 19121834623 is a prime.

It is a super-2 number, since 2×19121838719² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19121838713) 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, 169649 + ... + 258890.

It is an arithmetic number, because the mean of its divisors is an integer number (4780577970).

Almost surely, 2^19121838719 is an apocalyptic number.

19121838719 is a deficient number, since it is larger than the sum of its proper divisors (473161).

19121838719 is an equidigital number, since it uses as much as digits as its factorization.

19121838719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473160.

The product of its digits is 217728, while the sum is 50.

The spelling of 19121838719 in words is "nineteen billion, one hundred twenty-one million, eight hundred thirty-eight thousand, seven hundred nineteen".