19989114421 has 4 divisors (see below), whose sum is σ = 19989612972. Its totient is φ = 19988615872.

The previous prime is 19989114401. The next prime is 19989114427. The reversal of 19989114421 is 12441198991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12441198991 = 13 ⋅957015307.

It can be written as a sum of positive squares in 2 ways, for example, as 4887408100 + 15101706321 = 69910^2 + 122889^2 .

It is a cyclic number.

It is not a de Polignac number, because 19989114421 - 2⁹ = 19989113909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19989114427) 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, 183316 + ... + 271261.

It is an arithmetic number, because the mean of its divisors is an integer number (4997403243).

Almost surely, 2^19989114421 is an apocalyptic number.

It is an amenable number.

19989114421 is a deficient number, since it is larger than the sum of its proper divisors (498551).

19989114421 is an equidigital number, since it uses as much as digits as its factorization.

19989114421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498550.

The product of its digits is 186624, while the sum is 49.

The spelling of 19989114421 in words is "nineteen billion, nine hundred eighty-nine million, one hundred fourteen thousand, four hundred twenty-one".