2112212112121 has 4 divisors (see below), whose sum is σ = 2112215018832. Its totient is φ = 2112209205412.

The previous prime is 2112212112097. The next prime is 2112212112137. The reversal of 2112212112121 is 1212112122112.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2112212112121 - 2¹³ = 2112212103929 is a prime.

It is a super-2 number, since 2×2112212112121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112212112181) 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, 718650 + ... + 2177356.

It is an arithmetic number, because the mean of its divisors is an integer number (528053754708).

Almost surely, 2^{2112212112121} is an apocalyptic number.

It is an amenable number.

2112212112121 is a deficient number, since it is larger than the sum of its proper divisors (2906711).

2112212112121 is a wasteful number, since it uses less digits than its factorization.

2112212112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906710.

The product of its digits is 64, while the sum is 19.

Adding to 2112212112121 its reverse (1212112122112), we get a palindrome (3324324234233).

Subtracting from 2112212112121 its reverse (1212112122112), we obtain a palindrome (900099990009).

The spelling of 2112212112121 in words is "two trillion, one hundred twelve billion, two hundred twelve million, one hundred twelve thousand, one hundred twenty-one".