1212222223321 has 4 divisors (see below), whose sum is σ = 1212226623972. Its totient is φ = 1212217822672.

The previous prime is 1212222223307. The next prime is 1212222223327. The reversal of 1212222223321 is 1233222222121.

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 420947928025 + 791274295296 = 648805^2 + 889536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212222223321 - 2¹³ = 1212222215129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212222223327) 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, 1757410 + ... + 2347963.

It is an arithmetic number, because the mean of its divisors is an integer number (303056655993).

Almost surely, 2^{1212222223321} is an apocalyptic number.

It is an amenable number.

1212222223321 is a deficient number, since it is larger than the sum of its proper divisors (4400651).

1212222223321 is an equidigital number, since it uses as much as digits as its factorization.

1212222223321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400650.

The product of its digits is 2304, while the sum is 25.

Adding to 1212222223321 its reverse (1233222222121), we get a palindrome (2445444445442).

The spelling of 1212222223321 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, two hundred twenty-three thousand, three hundred twenty-one".