1221333133 has 16 divisors (see below), whose sum is σ = 1296852480. Its totient is φ = 1148313600.

The previous prime is 1221333121. The next prime is 1221333137. The reversal of 1221333133 is 3313331221.

It is a cyclic number.

It is not a de Polignac number, because 1221333133 - 2¹⁷ = 1221202061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221333137) 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 15 ways as a sum of consecutive naturals, for example, 324778 + ... + 328516.

It is an arithmetic number, because the mean of its divisors is an integer number (81053280).

Almost surely, 2^1221333133 is an apocalyptic number.

It is an amenable number.

1221333133 is a deficient number, since it is larger than the sum of its proper divisors (75519347).

1221333133 is a wasteful number, since it uses less digits than its factorization.

1221333133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068.

The product of its digits is 972, while the sum is 22.

The square root of 1221333133 is about 34947.5769260188. The cubic root of 1221333133 is about 1068.9187940005.

Adding to 1221333133 its reverse (3313331221), we get a palindrome (4534664354).

The spelling of 1221333133 in words is "one billion, two hundred twenty-one million, three hundred thirty-three thousand, one hundred thirty-three".