222120122221 has 4 divisors (see below), whose sum is σ = 222152093500. Its totient is φ = 222088150944.

The previous prime is 222120122183. The next prime is 222120122261. The reversal of 222120122221 is 122221021222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122221021222 = 2 ⋅61110510611.

It can be written as a sum of positive squares in 2 ways, for example, as 131033864196 + 91086258025 = 361986^2 + 301805^2 .

It is a cyclic number.

It is not a de Polignac number, because 222120122221 - 2⁷ = 222120122093 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 (222120122261) 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, 15975216 + ... + 15989113.

It is an arithmetic number, because the mean of its divisors is an integer number (55538023375).

Almost surely, 2^222120122221 is an apocalyptic number.

It is an amenable number.

222120122221 is a deficient number, since it is larger than the sum of its proper divisors (31971279).

222120122221 is an equidigital number, since it uses as much as digits as its factorization.

222120122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31971278.

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

Adding to 222120122221 its reverse (122221021222), we get a palindrome (344341143443).

It can be divided in two parts, 2221201 and 22221, that added together give a palindrome (2243422).

The spelling of 222120122221 in words is "two hundred twenty-two billion, one hundred twenty million, one hundred twenty-two thousand, two hundred twenty-one".