12321222001 has 9 divisors (see below), whose sum is σ = 13544503609. Its totient is φ = 11200000900.

The previous prime is 12321221993. The next prime is 12321222013. The reversal of 12321222001 is 10022212321.

It is a happy number.

The square root of 12321222001 is 111001.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 12321222001 - 2³ = 12321221993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12321222301) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1215966 + ... + 1226056.

Almost surely, 2^12321222001 is an apocalyptic number.

12321222001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12321222001 is the 111001-st square number.

12321222001 is the 55501-st centered octagonal number.

It is an amenable number.

12321222001 is a deficient number, since it is larger than the sum of its proper divisors (1223281608).

12321222001 is an frugal number, since it uses more digits than its factorization.

12321222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20204 (or 10102 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Multiplying 12321222001 by its sum of digits (16), we get a square (197139552016 = 444004²).

Adding to 12321222001 its reverse (10022212321), we get a palindrome (22343434322).

The spelling of 12321222001 in words is "twelve billion, three hundred twenty-one million, two hundred twenty-two thousand, one".