111211121009999 has 4 divisors (see below), whose sum is σ = 117752951657664. Its totient is φ = 104669290362336.

The previous prime is 111211121009953. The next prime is 111211121010007. The reversal of 111211121009999 is 999900121112111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111211121009999 - 2⁸ = 111211121009743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211121009929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3270915323807 + ... + 3270915323840.

It is an arithmetic number, because the mean of its divisors is an integer number (29438237914416).

Almost surely, 2^{111211121009999} is an apocalyptic number.

111211121009999 is a deficient number, since it is larger than the sum of its proper divisors (6541830647665).

111211121009999 is an equidigital number, since it uses as much as digits as its factorization.

111211121009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6541830647664.

The product of its (nonzero) digits is 26244, while the sum is 47.

The spelling of 111211121009999 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred twenty-one million, nine thousand, nine hundred ninety-nine".