7891222011 has 16 divisors (see below), whose sum is σ = 10784425728. Its totient is φ = 5130972000.

The previous prime is 7891221973. The next prime is 7891222021. The reversal of 7891222011 is 1102221987.

It is not a de Polignac number, because 7891222011 - 2⁷ = 7891221883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7891222021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174055 + ... + 214656.

It is an arithmetic number, because the mean of its divisors is an integer number (674026608).

Almost surely, 2^7891222011 is an apocalyptic number.

7891222011 is a deficient number, since it is larger than the sum of its proper divisors (2893203717).

7891222011 is a wasteful number, since it uses less digits than its factorization.

7891222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388882.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 7891222011 is about 88832.5504024285. The cubic root of 7891222011 is about 1990.8937687866.

Adding to 7891222011 its reverse (1102221987), we get a palindrome (8993443998).

The spelling of 7891222011 in words is "seven billion, eight hundred ninety-one million, two hundred twenty-two thousand, eleven".