1221001133 has 4 divisors (see below), whose sum is σ = 1332001248. Its totient is φ = 1110001020.

The previous prime is 1221001127. The next prime is 1221001141. The reversal of 1221001133 is 3311001221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221001133 - 2²⁰ = 1219952557 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 (1221001153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55500041 + ... + 55500062.

It is an arithmetic number, because the mean of its divisors is an integer number (333000312).

Almost surely, 2^1221001133 is an apocalyptic number.

It is an amenable number.

1221001133 is a deficient number, since it is larger than the sum of its proper divisors (111000115).

1221001133 is a wasteful number, since it uses less digits than its factorization.

1221001133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111000114.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1221001133 is about 34942.8266315134. The cubic root of 1221001133 is about 1068.8219290280.

Adding to 1221001133 its reverse (3311001221), we get a palindrome (4532002354).

The spelling of 1221001133 in words is "one billion, two hundred twenty-one million, one thousand, one hundred thirty-three".