19119919103921 has 2 divisors, whose sum is σ = 19119919103922. Its totient is φ = 19119919103920.

The previous prime is 19119919103911. The next prime is 19119919104001. The reversal of 19119919103921 is 12930191991191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19068383293696 + 51535810225 = 4366736^2 + 227015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19119919103921 is a prime.

It is not a weakly prime, because it can be changed into another prime (19119919103911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9559959551960 + 9559959551961.

It is an arithmetic number, because the mean of its divisors is an integer number (9559959551961).

Almost surely, 2^{19119919103921} is an apocalyptic number.

It is an amenable number.

19119919103921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19119919103921 is an equidigital number, since it uses as much as digits as its factorization.

19119919103921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 354294, while the sum is 56.

The spelling of 19119919103921 in words is "nineteen trillion, one hundred nineteen billion, nine hundred nineteen million, one hundred three thousand, nine hundred twenty-one".