2112221010121 has 4 divisors (see below), whose sum is σ = 2236469304852. Its totient is φ = 1987972715392.

The previous prime is 2112221010091. The next prime is 2112221010143. The reversal of 2112221010121 is 1210101222112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1456462785600 + 655758224521 = 1206840^2 + 809789^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112221010121 - 2⁵ = 2112221010089 is a prime.

It is a super-2 number, since 2×2112221010121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112221010095 and 2112221010104.

It is not an unprimeable number, because it can be changed into a prime (2112221070121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62124147340 + ... + 62124147373.

It is an arithmetic number, because the mean of its divisors is an integer number (559117326213).

Almost surely, 2^{2112221010121} is an apocalyptic number.

It is an amenable number.

2112221010121 is a deficient number, since it is larger than the sum of its proper divisors (124248294731).

2112221010121 is a wasteful number, since it uses less digits than its factorization.

2112221010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124248294730.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2112221010121 its reverse (1210101222112), we get a palindrome (3322322232233).

The spelling of 2112221010121 in words is "two trillion, one hundred twelve billion, two hundred twenty-one million, ten thousand, one hundred twenty-one".