19120111221 has 4 divisors (see below), whose sum is σ = 25493481632. Its totient is φ = 12746740812.

The previous prime is 19120111187. The next prime is 19120111237. The reversal of 19120111221 is 12211102191.

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 not a de Polignac number, because 19120111221 - 2¹³ = 19120103029 is a prime.

It is a super-2 number, since 2×19120111221² (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 (19120111261) 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, 3186685201 + ... + 3186685206.

It is an arithmetic number, because the mean of its divisors is an integer number (6373370408).

Almost surely, 2^19120111221 is an apocalyptic number.

It is an amenable number.

19120111221 is a deficient number, since it is larger than the sum of its proper divisors (6373370411).

19120111221 is an equidigital number, since it uses as much as digits as its factorization.

19120111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6373370410.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 19120111221 in words is "nineteen billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-one".