221323434121 has 2 divisors, whose sum is σ = 221323434122. Its totient is φ = 221323434120.

The previous prime is 221323434113. The next prime is 221323434203. The reversal of 221323434121 is 121434323122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210052639225 + 11270794896 = 458315^2 + 106164^2 .

It is a cyclic number.

It is not a de Polignac number, because 221323434121 - 2³ = 221323434113 is a prime.

It is a super-2 number, since 2×221323434121² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221323434121.

It is not a weakly prime, because it can be changed into another prime (221323434221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110661717060 + 110661717061.

It is an arithmetic number, because the mean of its divisors is an integer number (110661717061).

Almost surely, 2^221323434121 is an apocalyptic number.

It is an amenable number.

221323434121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221323434121 is an equidigital number, since it uses as much as digits as its factorization.

221323434121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

Adding to 221323434121 its reverse (121434323122), we get a palindrome (342757757243).

The spelling of 221323434121 in words is "two hundred twenty-one billion, three hundred twenty-three million, four hundred thirty-four thousand, one hundred twenty-one".