1221143152241 has 2 divisors, whose sum is σ = 1221143152242. Its totient is φ = 1221143152240.

The previous prime is 1221143152231. The next prime is 1221143152267. The reversal of 1221143152241 is 1422513411221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210968193600 + 10174958641 = 1100440^2 + 100871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221143152241 is a prime.

It is a super-2 number, since 2×1221143152241² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221143152231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610571576120 + 610571576121.

It is an arithmetic number, because the mean of its divisors is an integer number (610571576121).

Almost surely, 2^{1221143152241} is an apocalyptic number.

It is an amenable number.

1221143152241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221143152241 is an equidigital number, since it uses as much as digits as its factorization.

1221143152241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

Adding to 1221143152241 its reverse (1422513411221), we get a palindrome (2643656563462).

The spelling of 1221143152241 in words is "one trillion, two hundred twenty-one billion, one hundred forty-three million, one hundred fifty-two thousand, two hundred forty-one".