221222120221 has 4 divisors (see below), whose sum is σ = 221546018592. Its totient is φ = 220898221852.

The previous prime is 221222120213. The next prime is 221222120227. The reversal of 221222120221 is 122021222122.

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 an emirpimes, since its reverse is a distinct semiprime: 122021222122 = 2 ⋅61010611061.

It is a cyclic number.

It is not a de Polignac number, because 221222120221 - 2³ = 221222120213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222120227) 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, 161948161 + ... + 161949526.

It is an arithmetic number, because the mean of its divisors is an integer number (55386504648).

Almost surely, 2^221222120221 is an apocalyptic number.

It is an amenable number.

221222120221 is a deficient number, since it is larger than the sum of its proper divisors (323898371).

221222120221 is an equidigital number, since it uses as much as digits as its factorization.

221222120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323898370.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221222120221 its reverse (122021222122), we get a palindrome (343243342343).

The spelling of 221222120221 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty-one".