1221120133 has 4 divisors (see below), whose sum is σ = 1232323180. Its totient is φ = 1209917088.

The previous prime is 1221120127. The next prime is 1221120137. The reversal of 1221120133 is 3310211221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3310211221 = 23 ⋅143922227.

It can be written as a sum of positive squares in 2 ways, for example, as 732135364 + 488984769 = 27058^2 + 22113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221120133 is a prime.

It is a super-2 number, since 2×1221120133² = 2982268758435875378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5601360 + ... + 5601577.

It is an arithmetic number, because the mean of its divisors is an integer number (308080795).

Almost surely, 2^1221120133 is an apocalyptic number.

It is an amenable number.

1221120133 is a deficient number, since it is larger than the sum of its proper divisors (11203047).

1221120133 is a wasteful number, since it uses less digits than its factorization.

1221120133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11203046.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1221120133 is about 34944.5293715626. The cubic root of 1221120133 is about 1068.8566507206.

Adding to 1221120133 its reverse (3310211221), we get a palindrome (4531331354).

The spelling of 1221120133 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred thirty-three".