11556345121212 has 24 divisors (see below), whose sum is σ = 26973084405456. Its totient is φ = 3850932308608.

The previous prime is 11556345121199. The next prime is 11556345121219. The reversal of 11556345121212 is 21212154365511.

It is a super-2 number, since 2×11556345121212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556345121219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147800763 + ... + 147878930.

It is an arithmetic number, because the mean of its divisors is an integer number (1123878516894).

Almost surely, 2^{11556345121212} is an apocalyptic number.

11556345121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11556345121212 is an abundant number, since it is smaller than the sum of its proper divisors (15416739284244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11556345121212 is a wasteful number, since it uses less digits than its factorization.

11556345121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295682957 (or 295682955 counting only the distinct ones).

The product of its digits is 72000, while the sum is 39.

Adding to 11556345121212 its reverse (21212154365511), we get a palindrome (32768499486723).

The spelling of 11556345121212 in words is "eleven trillion, five hundred fifty-six billion, three hundred forty-five million, one hundred twenty-one thousand, two hundred twelve".