1221135133 has 2 divisors, whose sum is σ = 1221135134. Its totient is φ = 1221135132.

The previous prime is 1221135121. The next prime is 1221135163. The reversal of 1221135133 is 3315311221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1213616569 + 7518564 = 34837^2 + 2742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221135133 - 2¹⁷ = 1221004061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221135163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610567566 + 610567567.

It is an arithmetic number, because the mean of its divisors is an integer number (610567567).

Almost surely, 2^1221135133 is an apocalyptic number.

It is an amenable number.

1221135133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221135133 is an equidigital number, since it uses as much as digits as its factorization.

1221135133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 22.

The square root of 1221135133 is about 34944.7439967730. The cubic root of 1221135133 is about 1068.8610272444.

Adding to 1221135133 its reverse (3315311221), we get a palindrome (4536446354).

The spelling of 1221135133 in words is "one billion, two hundred twenty-one million, one hundred thirty-five thousand, one hundred thirty-three".