2112202221221 has 4 divisors (see below), whose sum is σ = 2223370759200. Its totient is φ = 2001033683244.

The previous prime is 2112202221197. The next prime is 2112202221251. The reversal of 2112202221221 is 1221222022112.

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 de Polignac number, because none of the positive numbers 2^k-2112202221221 is a prime.

It is a super-2 number, since 2×2112202221221² (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 = 2112202221193 and 2112202221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112202221251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55584268961 + ... + 55584268998.

It is an arithmetic number, because the mean of its divisors is an integer number (555842689800).

Almost surely, 2^{2112202221221} is an apocalyptic number.

It is an amenable number.

2112202221221 is a deficient number, since it is larger than the sum of its proper divisors (111168537979).

2112202221221 is a wasteful number, since it uses less digits than its factorization.

2112202221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111168537978.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2112202221221 its reverse (1221222022112), we get a palindrome (3333424243333).

The spelling of 2112202221221 in words is "two trillion, one hundred twelve billion, two hundred two million, two hundred twenty-one thousand, two hundred twenty-one".