11231220131055 has 48 divisors (see below), whose sum is σ = 20884618853280. Its totient is φ = 5783432876928.

The previous prime is 11231220131051. The next prime is 11231220131063. The reversal of 11231220131055 is 55013102213211.

11231220131055 is a `hidden beast` number, since 1 + 12 + 312 + 20 + 1 + 310 + 5 + 5 = 666.

It is not a de Polignac number, because 11231220131055 - 2² = 11231220131051 is a prime.

It is a super-2 number, since 2×11231220131055² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231220131051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 159340672 + ... + 159411141.

It is an arithmetic number, because the mean of its divisors is an integer number (435096226110).

Almost surely, 2^{11231220131055} is an apocalyptic number.

11231220131055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11231220131055 is a deficient number, since it is larger than the sum of its proper divisors (9653398722225).

11231220131055 is an equidigital number, since it uses as much as digits as its factorization.

11231220131055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318751862 (or 318751850 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 11231220131055 its reverse (55013102213211), we get a palindrome (66244322344266).

The spelling of 11231220131055 in words is "eleven trillion, two hundred thirty-one billion, two hundred twenty million, one hundred thirty-one thousand, fifty-five".