1211442123013 has 2 divisors, whose sum is σ = 1211442123014. Its totient is φ = 1211442123012.

The previous prime is 1211442122999. The next prime is 1211442123061. The reversal of 1211442123013 is 3103212441121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1209223524609 + 2218598404 = 1099647^2 + 47102^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211442123013 is a prime.

It is a super-3 number, since 3×1211442123013³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211442123083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605721061506 + 605721061507.

It is an arithmetic number, because the mean of its divisors is an integer number (605721061507).

Almost surely, 2^{1211442123013} is an apocalyptic number.

It is an amenable number.

1211442123013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211442123013 is an equidigital number, since it uses as much as digits as its factorization.

1211442123013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 1211442123013 its reverse (3103212441121), we get a palindrome (4314654564134).

The spelling of 1211442123013 in words is "one trillion, two hundred eleven billion, four hundred forty-two million, one hundred twenty-three thousand, thirteen".