2112220212121 has 2 divisors, whose sum is σ = 2112220212122. Its totient is φ = 2112220212120.

The previous prime is 2112220212101. The next prime is 2112220212139. The reversal of 2112220212121 is 1212120222112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1788304425625 + 323915786496 = 1337275^2 + 569136^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112220212121 - 2²⁵ = 2112186657689 is a prime.

It is a super-2 number, since 2×2112220212121² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2112220212101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056110106060 + 1056110106061.

It is an arithmetic number, because the mean of its divisors is an integer number (1056110106061).

Almost surely, 2^{2112220212121} is an apocalyptic number.

It is an amenable number.

2112220212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112220212121 is an equidigital number, since it uses as much as digits as its factorization.

2112220212121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2112220212121 its reverse (1212120222112), we get a palindrome (3324340434233).

Subtracting from 2112220212121 its reverse (1212120222112), we obtain a palindrome (900099990009).

The spelling of 2112220212121 in words is "two trillion, one hundred twelve billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".