1211000122121 has 2 divisors, whose sum is σ = 1211000122122. Its totient is φ = 1211000122120.

The previous prime is 1211000122099. The next prime is 1211000122183. The reversal of 1211000122121 is 1212210001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1164402855625 + 46597266496 = 1079075^2 + 215864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211000122121 - 2¹⁴ = 1211000105737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211000122096 and 1211000122105.

It is not a weakly prime, because it can be changed into another prime (1211000022121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605500061060 + 605500061061.

It is an arithmetic number, because the mean of its divisors is an integer number (605500061061).

Almost surely, 2^{1211000122121} is an apocalyptic number.

It is an amenable number.

1211000122121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211000122121 is an equidigital number, since it uses as much as digits as its factorization.

1211000122121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211000122121 its reverse (1212210001121), we get a palindrome (2423210123242).

The spelling of 1211000122121 in words is "one trillion, two hundred eleven billion, one hundred twenty-two thousand, one hundred twenty-one".