1212120222121 has 2 divisors, whose sum is σ = 1212120222122. Its totient is φ = 1212120222120.

The previous prime is 1212120222109. The next prime is 1212120222127. The reversal of 1212120222121 is 1212220212121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 872610066496 + 339510155625 = 934136^2 + 582675^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212120222121 - 2²⁷ = 1211986004393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212120222127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606060111060 + 606060111061.

It is an arithmetic number, because the mean of its divisors is an integer number (606060111061).

Almost surely, 2^{1212120222121} is an apocalyptic number.

It is an amenable number.

1212120222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212120222121 is an equidigital number, since it uses as much as digits as its factorization.

1212120222121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1212120222121 its reverse (1212220212121), we get a palindrome (2424340434242).

The spelling of 1212120222121 in words is "one trillion, two hundred twelve billion, one hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".