1131211103221 has 2 divisors, whose sum is σ = 1131211103222. Its totient is φ = 1131211103220.

The previous prime is 1131211103201. The next prime is 1131211103263. The reversal of 1131211103221 is 1223011121311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1056041914321 + 75169188900 = 1027639^2 + 274170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131211103221 - 2¹⁷ = 1131210972149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131211103201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565605551610 + 565605551611.

It is an arithmetic number, because the mean of its divisors is an integer number (565605551611).

Almost surely, 2^{1131211103221} is an apocalyptic number.

It is an amenable number.

1131211103221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131211103221 is an equidigital number, since it uses as much as digits as its factorization.

1131211103221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1131211103221 its reverse (1223011121311), we get a palindrome (2354222224532).

The spelling of 1131211103221 in words is "one trillion, one hundred thirty-one billion, two hundred eleven million, one hundred three thousand, two hundred twenty-one".