1212222012121 has 2 divisors, whose sum is σ = 1212222012122. Its totient is φ = 1212222012120.

The previous prime is 1212222012119. The next prime is 1212222012143. The reversal of 1212222012121 is 1212102222121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651670322121 + 560551690000 = 807261^2 + 748700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212222012121 - 2¹ = 1212222012119 is a prime.

Together with 1212222012119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1212222012101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606111006060 + 606111006061.

It is an arithmetic number, because the mean of its divisors is an integer number (606111006061).

Almost surely, 2^{1212222012121} is an apocalyptic number.

It is an amenable number.

1212222012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212222012121 is an equidigital number, since it uses as much as digits as its factorization.

1212222012121 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 1212222012121 its reverse (1212102222121), we get a palindrome (2424324234242).

The spelling of 1212222012121 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, twelve thousand, one hundred twenty-one".