1212211020121 has 2 divisors, whose sum is σ = 1212211020122. Its totient is φ = 1212211020120.

The previous prime is 1212211020073. The next prime is 1212211020127. The reversal of 1212211020121 is 1210201122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188123980121 + 24087040000 = 1090011^2 + 155200^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212211020121 - 2¹³ = 1212211011929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212211020095 and 1212211020104.

It is not a weakly prime, because it can be changed into another prime (1212211020127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105510060 + 606105510061.

It is an arithmetic number, because the mean of its divisors is an integer number (606105510061).

Almost surely, 2^{1212211020121} is an apocalyptic number.

It is an amenable number.

1212211020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212211020121 is an equidigital number, since it uses as much as digits as its factorization.

1212211020121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1212211020121 its reverse (1210201122121), we get a palindrome (2422412142242).

The spelling of 1212211020121 in words is "one trillion, two hundred twelve billion, two hundred eleven million, twenty thousand, one hundred twenty-one".