1914899419921 has 2 divisors, whose sum is σ = 1914899419922. Its totient is φ = 1914899419920.

The previous prime is 1914899419879. The next prime is 1914899419931. The reversal of 1914899419921 is 1299149984191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1593110974225 + 321788445696 = 1262185^2 + 567264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1914899419921 - 2⁹ = 1914899419409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1914899419931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957449709960 + 957449709961.

It is an arithmetic number, because the mean of its divisors is an integer number (957449709961).

Almost surely, 2^{1914899419921} is an apocalyptic number.

It is an amenable number.

1914899419921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1914899419921 is an equidigital number, since it uses as much as digits as its factorization.

1914899419921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 67.

The spelling of 1914899419921 in words is "one trillion, nine hundred fourteen billion, eight hundred ninety-nine million, four hundred nineteen thousand, nine hundred twenty-one".