22222199991 has 16 divisors (see below), whose sum is σ = 30701721600. Its totient is φ = 14282374560.

The previous prime is 22222199971. The next prime is 22222199999. The reversal of 22222199991 is 19999122222.

It is not a de Polignac number, because 22222199991 - 2⁹ = 22222199479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22222199991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222199999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429816 + ... + 478733.

It is an arithmetic number, because the mean of its divisors is an integer number (1918857600).

Almost surely, 2^22222199991 is an apocalyptic number.

22222199991 is a deficient number, since it is larger than the sum of its proper divisors (8479521609).

22222199991 is a wasteful number, since it uses less digits than its factorization.

22222199991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908846.

The product of its digits is 209952, while the sum is 48.

The spelling of 22222199991 in words is "twenty-two billion, two hundred twenty-two million, one hundred ninety-nine thousand, nine hundred ninety-one".