12123323221001 has 4 divisors (see below), whose sum is σ = 12123478692372. Its totient is φ = 12123167749632.

The previous prime is 12123323220979. The next prime is 12123323221033. The reversal of 12123323221001 is 10012232332121.

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 1246123457401 + 10877199763600 = 1116299^2 + 3298060^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123323221001 - 2²⁶ = 12123256112137 is a prime.

It is a super-2 number, since 2×12123323221001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12123323221081) 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, 77618660 + ... + 77774693.

It is an arithmetic number, because the mean of its divisors is an integer number (3030869673093).

Almost surely, 2^{12123323221001} is an apocalyptic number.

It is an amenable number.

12123323221001 is a deficient number, since it is larger than the sum of its proper divisors (155471371).

12123323221001 is an equidigital number, since it uses as much as digits as its factorization.

12123323221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155471370.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 12123323221001 its reverse (10012232332121), we get a palindrome (22135555553122).

The spelling of 12123323221001 in words is "twelve trillion, one hundred twenty-three billion, three hundred twenty-three million, two hundred twenty-one thousand, one".