1152221121 has 24 divisors (see below), whose sum is σ = 1799725824. Its totient is φ = 707575680.

The previous prime is 1152221117. The next prime is 1152221129. The reversal of 1152221121 is 1211222511.

1152221121 is a `hidden beast` number, since 1 + 1 + 522 + 21 + 121 = 666.

It is not a de Polignac number, because 1152221121 - 2² = 1152221117 is a prime.

It is a super-2 number, since 2×1152221121² = 2655227023356993282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1152221094 and 1152221103.

It is not an unprimeable number, because it can be changed into a prime (1152221129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72925 + ... + 87306.

It is an arithmetic number, because the mean of its divisors is an integer number (74988576).

Almost surely, 2^1152221121 is an apocalyptic number.

It is an amenable number.

1152221121 is a deficient number, since it is larger than the sum of its proper divisors (647504703).

1152221121 is a wasteful number, since it uses less digits than its factorization.

1152221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160301 (or 160298 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 1152221121 is about 33944.3827606277. The cubic root of 1152221121 is about 1048.3636252628.

Adding to 1152221121 its reverse (1211222511), we get a palindrome (2363443632).

The spelling of 1152221121 in words is "one billion, one hundred fifty-two million, two hundred twenty-one thousand, one hundred twenty-one".