111772121211 has 24 divisors (see below), whose sum is σ = 167446681584. Its totient is φ = 74506521600.

The previous prime is 111772121171. The next prime is 111772121231. The reversal of 111772121211 is 112121277111.

It is not a de Polignac number, because 111772121211 - 2²⁶ = 111705012347 is a prime.

It is a super-2 number, since 2×111772121211² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (111772121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2848155 + ... + 2887131.

It is an arithmetic number, because the mean of its divisors is an integer number (6976945066).

Almost surely, 2^111772121211 is an apocalyptic number.

111772121211 is a deficient number, since it is larger than the sum of its proper divisors (55674560373).

111772121211 is an equidigital number, since it uses as much as digits as its factorization.

111772121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50793 (or 50781 counting only the distinct ones).

The product of its digits is 392, while the sum is 27.

Adding to 111772121211 its reverse (112121277111), we get a palindrome (223893398322).

The spelling of 111772121211 in words is "one hundred eleven billion, seven hundred seventy-two million, one hundred twenty-one thousand, two hundred eleven".