11581889121 has 24 divisors (see below), whose sum is σ = 18255365856. Its totient is φ = 7017359040.

The previous prime is 11581889119. The next prime is 11581889161. The reversal of 11581889121 is 12198818511.

It is not a de Polignac number, because 11581889121 - 2¹ = 11581889119 is a prime.

It is a super-2 number, since 2×11581889121² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11581889161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 388866 + ... + 417588.

It is an arithmetic number, because the mean of its divisors is an integer number (760640244).

Almost surely, 2^11581889121 is an apocalyptic number.

11581889121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11581889121 is a deficient number, since it is larger than the sum of its proper divisors (6673476735).

11581889121 is a wasteful number, since it uses less digits than its factorization.

11581889121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32813 (or 32810 counting only the distinct ones).

The product of its digits is 46080, while the sum is 45.

The spelling of 11581889121 in words is "eleven billion, five hundred eighty-one million, eight hundred eighty-nine thousand, one hundred twenty-one".