12222220321 has 4 divisors (see below), whose sum is σ = 12223207444. Its totient is φ = 12221233200.

The previous prime is 12222220291. The next prime is 12222220337. The reversal of 12222220321 is 12302222221.

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 11441297296 + 780923025 = 106964^2 + 27945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12222220321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12222227321) 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, 474750 + ... + 499831.

It is an arithmetic number, because the mean of its divisors is an integer number (3055801861).

Almost surely, 2^12222220321 is an apocalyptic number.

It is an amenable number.

12222220321 is a deficient number, since it is larger than the sum of its proper divisors (987123).

12222220321 is an equidigital number, since it uses as much as digits as its factorization.

12222220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987122.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 12222220321 its reverse (12302222221), we get a palindrome (24524442542).

The spelling of 12222220321 in words is "twelve billion, two hundred twenty-two million, two hundred twenty thousand, three hundred twenty-one".