11121999999 has 32 divisors (see below), whose sum is σ = 17117318400. Its totient is φ = 6352680960.

The previous prime is 11121999997. The next prime is 11122000033. The reversal of 11121999999 is 99999912111.

It is not a de Polignac number, because 11121999999 - 2¹ = 11121999997 is a prime.

11121999999 is a modest number, since divided by 999999 gives 11121 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121999997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75057 + ... + 166965.

It is an arithmetic number, because the mean of its divisors is an integer number (534916200).

Almost surely, 2^11121999999 is an apocalyptic number.

11121999999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

11121999999 is a deficient number, since it is larger than the sum of its proper divisors (5995318401).

11121999999 is a wasteful number, since it uses less digits than its factorization.

11121999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92135.

The product of its digits is 1062882, while the sum is 60.

It can be divided in two parts, 11 and 121999999, that added together give a triangular number (122000010 = T₁₅₆₂₀).

The spelling of 11121999999 in words is "eleven billion, one hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".