11100121155 has 12 divisors (see below), whose sum is σ = 19240210080. Its totient is φ = 5920064592.

The previous prime is 11100121129. The next prime is 11100121187. The reversal of 11100121155 is 55112100111.

It is not a de Polignac number, because 11100121155 - 2²⁵ = 11066566723 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123334635 + ... + 123334724.

It is an arithmetic number, because the mean of its divisors is an integer number (1603350840).

Almost surely, 2^11100121155 is an apocalyptic number.

11100121155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11100121155 is a deficient number, since it is larger than the sum of its proper divisors (8140088925).

11100121155 is a wasteful number, since it uses less digits than its factorization.

11100121155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246669370 (or 246669367 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 18.

Adding to 11100121155 its reverse (55112100111), we get a palindrome (66212221266).

The spelling of 11100121155 in words is "eleven billion, one hundred million, one hundred twenty-one thousand, one hundred fifty-five".