122221121212121 has 2 divisors, whose sum is σ = 122221121212122. Its totient is φ = 122221121212120.

The previous prime is 122221121212117. The next prime is 122221121212139. The reversal of 122221121212121 is 121212121122221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75988791294025 + 46232329918096 = 8717155^2 + 6799436^2 .

It is a cyclic number.

It is not a de Polignac number, because 122221121212121 - 2² = 122221121212117 is a prime.

It is not a weakly prime, because it can be changed into another prime (122221121212321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61110560606060 + 61110560606061.

It is an arithmetic number, because the mean of its divisors is an integer number (61110560606061).

Almost surely, 2^{122221121212121} is an apocalyptic number.

It is an amenable number.

122221121212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

122221121212121 is an equidigital number, since it uses as much as digits as its factorization.

122221121212121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 23.

Adding to 122221121212121 its reverse (121212121122221), we get a palindrome (243433242334342).

The spelling of 122221121212121 in words is "one hundred twenty-two trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twenty-one".