2112211121172 has 12 divisors (see below), whose sum is σ = 4928492616096. Its totient is φ = 704070373720.

The previous prime is 2112211121149. The next prime is 2112211121173. The reversal of 2112211121172 is 2711211122112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×2112211121172² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112211121173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88008796704 + ... + 88008796727.

It is an arithmetic number, because the mean of its divisors is an integer number (410707718008).

Almost surely, 2^{2112211121172} is an apocalyptic number.

It is an amenable number.

2112211121172 is an abundant number, since it is smaller than the sum of its proper divisors (2816281494924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2112211121172 is a wasteful number, since it uses less digits than its factorization.

2112211121172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176017593438 (or 176017593436 counting only the distinct ones).

The product of its digits is 224, while the sum is 24.

Adding to 2112211121172 its reverse (2711211122112), we get a palindrome (4823422243284).

The spelling of 2112211121172 in words is "two trillion, one hundred twelve billion, two hundred eleven million, one hundred twenty-one thousand, one hundred seventy-two".