2112138771228 has 18 divisors (see below), whose sum is σ = 5339017449584. Its totient is φ = 704046257064.

The previous prime is 2112138771221. The next prime is 2112138771319. The reversal of 2112138771228 is 8221778312112.

2112138771228 is a `hidden beast` number, since 21 + 1 + 21 + 387 + 7 + 1 + 228 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×2112138771228² (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 (2112138771221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29335260676 + ... + 29335260747.

Almost surely, 2^{2112138771228} is an apocalyptic number.

It is an amenable number.

2112138771228 is an abundant number, since it is smaller than the sum of its proper divisors (3226878678356).

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

2112138771228 is a wasteful number, since it uses less digits than its factorization.

2112138771228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58670521433 (or 58670521428 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

It can be divided in two parts, 211213 and 8771228, that added together give a triangular number (8982441 = T₄₂₃₈).

The spelling of 2112138771228 in words is "two trillion, one hundred twelve billion, one hundred thirty-eight million, seven hundred seventy-one thousand, two hundred twenty-eight".