1331221221133 has 2 divisors, whose sum is σ = 1331221221134. Its totient is φ = 1331221221132.

The previous prime is 1331221221089. The next prime is 1331221221139. The reversal of 1331221221133 is 3311221221331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 907260060004 + 423961161129 = 952502^2 + 651123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331221221133 - 2¹⁷ = 1331221090061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1331221221098 and 1331221221107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331221221139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665610610566 + 665610610567.

It is an arithmetic number, because the mean of its divisors is an integer number (665610610567).

Almost surely, 2^{1331221221133} is an apocalyptic number.

It is an amenable number.

1331221221133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331221221133 is an equidigital number, since it uses as much as digits as its factorization.

1331221221133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

Adding to 1331221221133 its reverse (3311221221331), we get a palindrome (4642442442464).

The spelling of 1331221221133 in words is "one trillion, three hundred thirty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred thirty-three".