111121112209977 has 18 divisors (see below), whose sum is σ = 163996003920138. Its totient is φ = 72504555471552.

The previous prime is 111121112209949. The next prime is 111121112209979. The reversal of 111121112209977 is 779902211121111.

It can be written as a sum of positive squares in only one way, i.e., 73805091998121 + 37316020211856 = 8590989^2 + 6108684^2 .

It is not a de Polignac number, because 111121112209977 - 2³⁹ = 110571356396089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111121112209979) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2794636128 + ... + 2794675889.

Almost surely, 2^{111121112209977} is an apocalyptic number.

It is an amenable number.

111121112209977 is a deficient number, since it is larger than the sum of its proper divisors (52874891710161).

111121112209977 is an equidigital number, since it uses as much as digits as its factorization.

111121112209977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589312117 (or 5589312067 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 45.

The spelling of 111121112209977 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred twelve million, two hundred nine thousand, nine hundred seventy-seven".