1221201133133 has 2 divisors, whose sum is σ = 1221201133134. Its totient is φ = 1221201133132.

The previous prime is 1221201133043. The next prime is 1221201133153. The reversal of 1221201133133 is 3313311021221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1199995366249 + 21205766884 = 1095443^2 + 145622^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221201133133 - 2³⁶ = 1152481656397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221201133099 and 1221201133108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221201133153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600566566 + 610600566567.

It is an arithmetic number, because the mean of its divisors is an integer number (610600566567).

Almost surely, 2^{1221201133133} is an apocalyptic number.

It is an amenable number.

1221201133133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201133133 is an equidigital number, since it uses as much as digits as its factorization.

1221201133133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1221201133133 its reverse (3313311021221), we get a palindrome (4534512154354).

The spelling of 1221201133133 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred thirty-three thousand, one hundred thirty-three".