2112229681 has 3 divisors (see below), whose sum is σ = 2112275641. Its totient is φ = 2112183722.

The previous prime is 2112229667. The next prime is 2112229687. The reversal of 2112229681 is 1869222112.

The square root of 2112229681 is 45959.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2112229681 - 2⁵ = 2112229649 is a prime.

It is a super-2 number, since 2×2112229681² = 8923028450594723522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112229687) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22980 + ... + 68938.

Almost surely, 2^2112229681 is an apocalyptic number.

2112229681 is the 45959-th square number.

2112229681 is the 22980-th centered octagonal number.

It is an amenable number.

2112229681 is a deficient number, since it is larger than the sum of its proper divisors (45960).

2112229681 is an frugal number, since it uses more digits than its factorization.

2112229681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91918 (or 45959 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The cubic root of 2112229681 is about 1283.0602397627.

The spelling of 2112229681 in words is "two billion, one hundred twelve million, two hundred twenty-nine thousand, six hundred eighty-one".