2112151663521 has 6 divisors (see below), whose sum is σ = 3050885736210. Its totient is φ = 1408101109008.

The previous prime is 2112151663519. The next prime is 2112151663541. The reversal of 2112151663521 is 1253661512112.

2112151663521 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 1 + 5 + 16 + 635 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1422771840000 + 689379823521 = 1192800^2 + 830289^2 .

It is not a de Polignac number, because 2112151663521 - 2¹ = 2112151663519 is a prime.

It is a super-2 number, since 2×2112151663521² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2112151663541) 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, 117341759076 + ... + 117341759093.

It is an arithmetic number, because the mean of its divisors is an integer number (508480956035).

Almost surely, 2^{2112151663521} is an apocalyptic number.

It is an amenable number.

2112151663521 is a deficient number, since it is larger than the sum of its proper divisors (938734072689).

2112151663521 is a wasteful number, since it uses less digits than its factorization.

2112151663521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234683518175 (or 234683518172 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The spelling of 2112151663521 in words is "two trillion, one hundred twelve billion, one hundred fifty-one million, six hundred sixty-three thousand, five hundred twenty-one".