221212321121113 has 6 divisors (see below), whose sum is σ = 257328618447066. Its totient is φ = 189610560960912.

The previous prime is 221212321121101. The next prime is 221212321121119. The reversal of 221212321121113 is 311121123212122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 216794202988489 + 4418118132624 = 14723933^2 + 2101932^2 .

It is not a de Polignac number, because 221212321121113 - 2⁴⁵ = 186027949032281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212321121119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2257268582820 + ... + 2257268582917.

It is an arithmetic number, because the mean of its divisors is an integer number (42888103074511).

Almost surely, 2^{221212321121113} is an apocalyptic number.

It is an amenable number.

221212321121113 is a deficient number, since it is larger than the sum of its proper divisors (36116297325953).

221212321121113 is an equidigital number, since it uses as much as digits as its factorization.

221212321121113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4514537165751 (or 4514537165744 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

Adding to 221212321121113 its reverse (311121123212122), we get a palindrome (532333444333235).

The spelling of 221212321121113 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred twenty-one million, one hundred twenty-one thousand, one hundred thirteen".