11100121123 has 16 divisors (see below), whose sum is σ = 13677189120. Its totient is φ = 8772548256.

The previous prime is 11100121121. The next prime is 11100121129. The reversal of 11100121123 is 32112100111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11100121123 - 2¹ = 11100121121 is a prime.

It is a super-2 number, since 2×11100121123² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (11100121121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11958 + ... + 149476.

It is an arithmetic number, because the mean of its divisors is an integer number (854824320).

Almost surely, 2^11100121123 is an apocalyptic number.

11100121123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11100121123 is a deficient number, since it is larger than the sum of its proper divisors (2577067997).

11100121123 is a wasteful number, since it uses less digits than its factorization.

11100121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138426.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11100121123 its reverse (32112100111), we get a palindrome (43212221234).

The spelling of 11100121123 in words is "eleven billion, one hundred million, one hundred twenty-one thousand, one hundred twenty-three".