22221959891 has 4 divisors (see below), whose sum is σ = 22988234400. Its totient is φ = 21455685384.

The previous prime is 22221959867. The next prime is 22221959897. The reversal of 22221959891 is 19895912222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19895912222 = 2 ⋅9947956111.

It is a cyclic number.

It is not a de Polignac number, because 22221959891 - 2³⁰ = 21148218067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22221959897) 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, 383137211 + ... + 383137268.

It is an arithmetic number, because the mean of its divisors is an integer number (5747058600).

Almost surely, 2^22221959891 is an apocalyptic number.

22221959891 is a deficient number, since it is larger than the sum of its proper divisors (766274509).

22221959891 is an equidigital number, since it uses as much as digits as its factorization.

22221959891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766274508.

The product of its digits is 466560, while the sum is 50.

The spelling of 22221959891 in words is "twenty-two billion, two hundred twenty-one million, nine hundred fifty-nine thousand, eight hundred ninety-one".