12122202221 has 4 divisors (see below), whose sum is σ = 12136414332. Its totient is φ = 12107990112.

The previous prime is 12122202193. The next prime is 12122202299. The reversal of 12122202221 is 12220222121.

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 2882186596 + 9240015625 = 53686^2 + 96125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12122202221 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 12122202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122204221) 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, 7104776 + ... + 7106481.

It is an arithmetic number, because the mean of its divisors is an integer number (3034103583).

Almost surely, 2^12122202221 is an apocalyptic number.

It is an amenable number.

12122202221 is a deficient number, since it is larger than the sum of its proper divisors (14212111).

12122202221 is an equidigital number, since it uses as much as digits as its factorization.

12122202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14212110.

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

Adding to 12122202221 its reverse (12220222121), we get a palindrome (24342424342).

The spelling of 12122202221 in words is "twelve billion, one hundred twenty-two million, two hundred two thousand, two hundred twenty-one".