1131221553105 has 48 divisors (see below), whose sum is σ = 2109307106880. Its totient is φ = 516184276608.

The previous prime is 1131221553103. The next prime is 1131221553113. The reversal of 1131221553105 is 5013551221311.

It is not a de Polignac number, because 1131221553105 - 2¹ = 1131221553103 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1131221553103) 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 47 ways as a sum of consecutive naturals, for example, 1004790 + ... + 1808879.

It is an arithmetic number, because the mean of its divisors is an integer number (43943898060).

Almost surely, 2^{1131221553105} is an apocalyptic number.

1131221553105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131221553105 is a deficient number, since it is larger than the sum of its proper divisors (978085553775).

1131221553105 is a wasteful number, since it uses less digits than its factorization.

1131221553105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2814238 (or 2814231 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

Adding to 1131221553105 its reverse (5013551221311), we get a palindrome (6144772774416).

The spelling of 1131221553105 in words is "one trillion, one hundred thirty-one billion, two hundred twenty-one million, five hundred fifty-three thousand, one hundred five".