22221211405 has 4 divisors (see below), whose sum is σ = 26665453692. Its totient is φ = 17776969120.

The previous prime is 22221211349. The next prime is 22221211409. The reversal of 22221211405 is 50411212222.

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 12960228649 + 9260982756 = 113843^2 + 96234^2 .

It is not a de Polignac number, because 22221211405 - 2¹¹ = 22221209357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221211409) 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, 2222121136 + ... + 2222121145.

It is an arithmetic number, because the mean of its divisors is an integer number (6666363423).

Almost surely, 2^22221211405 is an apocalyptic number.

It is an amenable number.

22221211405 is a deficient number, since it is larger than the sum of its proper divisors (4444242287).

22221211405 is an equidigital number, since it uses as much as digits as its factorization.

22221211405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444242286.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 22221211405 its reverse (50411212222), we get a palindrome (72632423627).

The spelling of 22221211405 in words is "twenty-two billion, two hundred twenty-one million, two hundred eleven thousand, four hundred five".