222012120221 has 4 divisors (see below), whose sum is σ = 222021348444. Its totient is φ = 222002892000.

The previous prime is 222012120199. The next prime is 222012120229. The reversal of 222012120221 is 122021210222.

It is a happy number.

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 44045416900 + 177966703321 = 209870^2 + 421861^2 .

It is a cyclic number.

It is not a de Polignac number, because 222012120221 - 2²² = 222007925917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222012120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222012120229) 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, 4577930 + ... + 4626171.

It is an arithmetic number, because the mean of its divisors is an integer number (55505337111).

Almost surely, 2^222012120221 is an apocalyptic number.

It is an amenable number.

222012120221 is a deficient number, since it is larger than the sum of its proper divisors (9228223).

222012120221 is an equidigital number, since it uses as much as digits as its factorization.

222012120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9228222.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222012120221 its reverse (122021210222), we get a palindrome (344033330443).

Subtracting from 222012120221 its reverse (122021210222), we obtain a palindrome (99990909999).

The spelling of 222012120221 in words is "two hundred twenty-two billion, twelve million, one hundred twenty thousand, two hundred twenty-one".