2112779607021 has 12 divisors (see below), whose sum is σ = 3052365081948. Its totient is φ = 1408255592064.

The previous prime is 2112779607013. The next prime is 2112779607083. The reversal of 2112779607021 is 1207069772112.

2112779607021 is a `hidden beast` number, since 2 + 1 + 12 + 7 + 7 + 9 + 607 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1286024040900 + 826755566121 = 1134030^2 + 909261^2 .

It is not a de Polignac number, because 2112779607021 - 2³ = 2112779607013 is a prime.

It is a super-2 number, since 2×2112779607021² (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 (2112779600021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21961500 + ... + 22057493.

It is an arithmetic number, because the mean of its divisors is an integer number (254363756829).

Almost surely, 2^{2112779607021} is an apocalyptic number.

It is an amenable number.

2112779607021 is a deficient number, since it is larger than the sum of its proper divisors (939585474927).

2112779607021 is a wasteful number, since it uses less digits than its factorization.

2112779607021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44024332 (or 44024329 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The spelling of 2112779607021 in words is "two trillion, one hundred twelve billion, seven hundred seventy-nine million, six hundred seven thousand, twenty-one".