2112127661 has 4 divisors (see below), whose sum is σ = 2413860192. Its totient is φ = 1810395132.

The previous prime is 2112127649. The next prime is 2112127663. The reversal of 2112127661 is 1667212112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2112127661 - 2¹⁴ = 2112111277 is a prime.

It is a super-2 number, since 2×2112127661² = 8922166512722661842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112127663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150866255 + ... + 150866268.

It is an arithmetic number, because the mean of its divisors is an integer number (603465048).

Almost surely, 2^2112127661 is an apocalyptic number.

It is an amenable number.

2112127661 is a deficient number, since it is larger than the sum of its proper divisors (301732531).

2112127661 is an equidigital number, since it uses as much as digits as its factorization.

2112127661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301732530.

The product of its digits is 2016, while the sum is 29.

The square root of 2112127661 is about 45957.8900842935. The cubic root of 2112127661 is about 1283.0395823007.

Adding to 2112127661 its reverse (1667212112), we get a palindrome (3779339773).

The spelling of 2112127661 in words is "two billion, one hundred twelve million, one hundred twenty-seven thousand, six hundred sixty-one".