1155116221 has 16 divisors (see below), whose sum is σ = 1399628160. Its totient is φ = 930631680.

The previous prime is 1155116173. The next prime is 1155116243. The reversal of 1155116221 is 1226115511.

It is not a de Polignac number, because 1155116221 - 2¹¹ = 1155114173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155176221) 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 15 ways as a sum of consecutive naturals, for example, 90525 + ... + 102493.

It is an arithmetic number, because the mean of its divisors is an integer number (87476760).

Almost surely, 2^1155116221 is an apocalyptic number.

It is an amenable number.

1155116221 is a deficient number, since it is larger than the sum of its proper divisors (244511939).

1155116221 is a wasteful number, since it uses less digits than its factorization.

1155116221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12804.

The product of its digits is 600, while the sum is 25.

The square root of 1155116221 is about 33987.0007649984. Note that the first 3 decimals coincide. The cubic root of 1155116221 is about 1049.2409392265.

It can be divided in two parts, 11551 and 16221, that added together give a palindrome (27772).

The spelling of 1155116221 in words is "one billion, one hundred fifty-five million, one hundred sixteen thousand, two hundred twenty-one".