2112120121 has 4 divisors (see below), whose sum is σ = 2112404112. Its totient is φ = 2111836132.

The previous prime is 2112120097. The next prime is 2112120133. The reversal of 2112120121 is 1210212112.

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 a cyclic number.

It is not a de Polignac number, because 2112120121 - 2⁵ = 2112120089 is a prime.

It is a super-2 number, since 2×2112120121² = 8922102811066109282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112120191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130531 + ... + 145816.

It is an arithmetic number, because the mean of its divisors is an integer number (528101028).

Almost surely, 2^2112120121 is an apocalyptic number.

It is an amenable number.

2112120121 is a deficient number, since it is larger than the sum of its proper divisors (283991).

2112120121 is an equidigital number, since it uses as much as digits as its factorization.

2112120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283990.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2112120121 is about 45957.8080526041. The cubic root of 2112120121 is about 1283.0380555417.

Adding to 2112120121 its reverse (1210212112), we get a palindrome (3322332233).

The spelling of 2112120121 in words is "two billion, one hundred twelve million, one hundred twenty thousand, one hundred twenty-one".