2122221012221 has 4 divisors (see below), whose sum is σ = 2122227650844. Its totient is φ = 2122214373600.

The previous prime is 2122221012209. The next prime is 2122221012229. The reversal of 2122221012221 is 1222101222212.

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 2068243783321 + 53977228900 = 1438139^2 + 232330^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122221012221 - 2³⁸ = 1847343105277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122221012193 and 2122221012202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122221012229) 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, 2814170 + ... + 3487691.

It is an arithmetic number, because the mean of its divisors is an integer number (530556912711).

Almost surely, 2^{2122221012221} is an apocalyptic number.

It is an amenable number.

2122221012221 is a deficient number, since it is larger than the sum of its proper divisors (6638623).

2122221012221 is an equidigital number, since it uses as much as digits as its factorization.

2122221012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6638622.

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

Adding to 2122221012221 its reverse (1222101222212), we get a palindrome (3344322234433).

The spelling of 2122221012221 in words is "two trillion, one hundred twenty-two billion, two hundred twenty-one million, twelve thousand, two hundred twenty-one".