1223212321 has 8 divisors (see below), whose sum is σ = 1244573864. Its totient is φ = 1201893120.

The previous prime is 1223212303. The next prime is 1223212363. The reversal of 1223212321 is 1232123221.

It can be written as a sum of positive squares in 4 ways, for example, as 731025 + 1222481296 = 855^2 + 34964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1223212321 - 2¹⁵ = 1223179553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223212391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50761 + ... + 70873.

It is an arithmetic number, because the mean of its divisors is an integer number (155571733).

Almost surely, 2^1223212321 is an apocalyptic number.

It is an amenable number.

1223212321 is a deficient number, since it is larger than the sum of its proper divisors (21361543).

1223212321 is an equidigital number, since it uses as much as digits as its factorization.

1223212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21171.

The product of its digits is 288, while the sum is 19.

The square root of 1223212321 is about 34974.4524045767. The cubic root of 1223212321 is about 1069.4667389677.

Adding to 1223212321 its reverse (1232123221), we get a palindrome (2455335542).

It can be divided in two parts, 1 and 223212321, that added together give a palindrome (223212322).

The spelling of 1223212321 in words is "one billion, two hundred twenty-three million, two hundred twelve thousand, three hundred twenty-one".