2111112121 has 4 divisors (see below), whose sum is σ = 2179212544. Its totient is φ = 2043011700.

The previous prime is 2111112119. The next prime is 2111112127. The reversal of 2111112121 is 1212111112.

It is a happy number.

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 2111112121 - 2¹ = 2111112119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111112127) 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, 34050165 + ... + 34050226.

It is an arithmetic number, because the mean of its divisors is an integer number (544803136).

Almost surely, 2^2111112121 is an apocalyptic number.

It is an amenable number.

2111112121 is a deficient number, since it is larger than the sum of its proper divisors (68100423).

2111112121 is an equidigital number, since it uses as much as digits as its factorization.

2111112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68100422.

The product of its digits is 8, while the sum is 13.

The square root of 2111112121 is about 45946.8401633888. The cubic root of 2111112121 is about 1282.8339149813.

Adding to 2111112121 its reverse (1212111112), we get a palindrome (3323223233).

It can be divided in two parts, 2111112 and 121, that multiplied together give a palindrome (255444552).

The spelling of 2111112121 in words is "two billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".