22191026291 has 4 divisors (see below), whose sum is σ = 25361172912. Its totient is φ = 19020879672.

The previous prime is 22191026239. The next prime is 22191026311. The reversal of 22191026291 is 19262019122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19262019122 = 2 ⋅9631009561.

It is a cyclic number.

It is not a de Polignac number, because 22191026291 - 2¹⁰ = 22191025267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22191026201) 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, 1585073300 + ... + 1585073313.

It is an arithmetic number, because the mean of its divisors is an integer number (6340293228).

Almost surely, 2^22191026291 is an apocalyptic number.

22191026291 is a deficient number, since it is larger than the sum of its proper divisors (3170146621).

22191026291 is an equidigital number, since it uses as much as digits as its factorization.

22191026291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3170146620.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 22191026291 in words is "twenty-two billion, one hundred ninety-one million, twenty-six thousand, two hundred ninety-one".