1211342429981 has 2 divisors, whose sum is σ = 1211342429982. Its totient is φ = 1211342429980.

The previous prime is 1211342429971. The next prime is 1211342430007. The reversal of 1211342429981 is 1899242431121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1145349444100 + 65992985881 = 1070210^2 + 256891^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211342429981 - 2¹⁰ = 1211342428957 is a prime.

It is a super-2 number, since 2×1211342429981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211342429971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605671214990 + 605671214991.

It is an arithmetic number, because the mean of its divisors is an integer number (605671214991).

Almost surely, 2^{1211342429981} is an apocalyptic number.

It is an amenable number.

1211342429981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211342429981 is an equidigital number, since it uses as much as digits as its factorization.

1211342429981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The spelling of 1211342429981 in words is "one trillion, two hundred eleven billion, three hundred forty-two million, four hundred twenty-nine thousand, nine hundred eighty-one".