1200031111121 has 2 divisors, whose sum is σ = 1200031111122. Its totient is φ = 1200031111120.

The previous prime is 1200031111079. The next prime is 1200031111133. The reversal of 1200031111121 is 1211111300021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 780501571600 + 419529539521 = 883460^2 + 647711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200031111121 - 2¹⁴ = 1200031094737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200031111096 and 1200031111105.

It is not a weakly prime, because it can be changed into another prime (1200031111421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600015555560 + 600015555561.

It is an arithmetic number, because the mean of its divisors is an integer number (600015555561).

Almost surely, 2^{1200031111121} is an apocalyptic number.

It is an amenable number.

1200031111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200031111121 is an equidigital number, since it uses as much as digits as its factorization.

1200031111121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 1200031111121 its reverse (1211111300021), we get a palindrome (2411142411142).

The spelling of 1200031111121 in words is "one trillion, two hundred billion, thirty-one million, one hundred eleven thousand, one hundred twenty-one".