1211099971241 has 2 divisors, whose sum is σ = 1211099971242. Its totient is φ = 1211099971240.

The previous prime is 1211099971223. The next prime is 1211099971259. The reversal of 1211099971241 is 1421799901121.

It is a balanced prime because it is at equal distance from previous prime (1211099971223) and next prime (1211099971259).

It can be written as a sum of positive squares in only one way, i.e., 1207590001216 + 3509970025 = 1098904^2 + 59245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211099971241 - 2⁶ = 1211099971177 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211099971441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605549985620 + 605549985621.

It is an arithmetic number, because the mean of its divisors is an integer number (605549985621).

Almost surely, 2^{1211099971241} is an apocalyptic number.

It is an amenable number.

1211099971241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211099971241 is an equidigital number, since it uses as much as digits as its factorization.

1211099971241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 47.

The spelling of 1211099971241 in words is "one trillion, two hundred eleven billion, ninety-nine million, nine hundred seventy-one thousand, two hundred forty-one".