22105447081 has 4 divisors (see below), whose sum is σ = 22105829572. Its totient is φ = 22105064592.

The previous prime is 22105447061. The next prime is 22105447097. The reversal of 22105447081 is 18074450122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18074450122 = 2 ⋅9037225061.

It can be written as a sum of positive squares in 2 ways, for example, as 15444275625 + 6661171456 = 124275^2 + 81616^2 .

It is a cyclic number.

It is not a de Polignac number, because 22105447081 - 2²¹ = 22103349929 is a prime.

It is a super-2 number, since 2×22105447081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22105447031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84810 + ... + 226723.

It is an arithmetic number, because the mean of its divisors is an integer number (5526457393).

Almost surely, 2^22105447081 is an apocalyptic number.

It is an amenable number.

22105447081 is a deficient number, since it is larger than the sum of its proper divisors (382491).

22105447081 is an equidigital number, since it uses as much as digits as its factorization.

22105447081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382490.

The product of its (nonzero) digits is 17920, while the sum is 34.

The spelling of 22105447081 in words is "twenty-two billion, one hundred five million, four hundred forty-seven thousand, eighty-one".