22121110405 has 4 divisors (see below), whose sum is σ = 26545332492. Its totient is φ = 17696888320.

The previous prime is 22121110393. The next prime is 22121110421. The reversal of 22121110405 is 50401112122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10453222081 + 11667888324 = 102241^2 + 108018^2 .

It is not a de Polignac number, because 22121110405 - 2¹⁷ = 22120979333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2212111036 + ... + 2212111045.

It is an arithmetic number, because the mean of its divisors is an integer number (6636333123).

Almost surely, 2^22121110405 is an apocalyptic number.

It is an amenable number.

22121110405 is a deficient number, since it is larger than the sum of its proper divisors (4424222087).

22121110405 is an equidigital number, since it uses as much as digits as its factorization.

22121110405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424222086.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 22121110405 its reverse (50401112122), we get a palindrome (72522222527).

The spelling of 22121110405 in words is "twenty-two billion, one hundred twenty-one million, one hundred ten thousand, four hundred five".