1121210142121 has 2 divisors, whose sum is σ = 1121210142122. Its totient is φ = 1121210142120.

The previous prime is 1121210142083. The next prime is 1121210142161. The reversal of 1121210142121 is 1212410121211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1048412166400 + 72797975721 = 1023920^2 + 269811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121210142121 - 2¹⁷ = 1121210011049 is a prime.

It is a super-2 number, since 2×1121210142121² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1121210142161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560605071060 + 560605071061.

It is an arithmetic number, because the mean of its divisors is an integer number (560605071061).

Almost surely, 2^{1121210142121} is an apocalyptic number.

It is an amenable number.

1121210142121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121210142121 is an equidigital number, since it uses as much as digits as its factorization.

1121210142121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 1121210142121 its reverse (1212410121211), we get a palindrome (2333620263332).

The spelling of 1121210142121 in words is "one trillion, one hundred twenty-one billion, two hundred ten million, one hundred forty-two thousand, one hundred twenty-one".