22121116205 has 4 divisors (see below), whose sum is σ = 26545339452. Its totient is φ = 17696892960.

The previous prime is 22121116181. The next prime is 22121116211. The reversal of 22121116205 is 50261112122.

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 13904418889 + 8216697316 = 117917^2 + 90646^2 .

It is not a de Polignac number, because 22121116205 - 2¹⁶ = 22121050669 is a prime.

It is a super-2 number, since 2×22121116205² (a number of 21 digits) contains 22 as substring.

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, 2212111616 + ... + 2212111625.

It is an arithmetic number, because the mean of its divisors is an integer number (6636334863).

Almost surely, 2^22121116205 is an apocalyptic number.

It is an amenable number.

22121116205 is a deficient number, since it is larger than the sum of its proper divisors (4424223247).

22121116205 is an equidigital number, since it uses as much as digits as its factorization.

22121116205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424223246.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 22121116205 its reverse (50261112122), we get a palindrome (72382228327).

The spelling of 22121116205 in words is "twenty-two billion, one hundred twenty-one million, one hundred sixteen thousand, two hundred five".