1231231221323 has 4 divisors (see below), whose sum is σ = 1232539650768. Its totient is φ = 1229922791880.

The previous prime is 1231231221299. The next prime is 1231231221347. The reversal of 1231231221323 is 3231221321321.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1231231221299) and next prime (1231231221347).

It is a cyclic number.

It is not a de Polignac number, because 1231231221323 - 2²⁶ = 1231164112459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231231221292 and 1231231221301.

It is not an unprimeable number, because it can be changed into a prime (1231231221373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654213311 + ... + 654215192.

It is an arithmetic number, because the mean of its divisors is an integer number (308134912692).

Almost surely, 2^{1231231221323} is an apocalyptic number.

1231231221323 is a deficient number, since it is larger than the sum of its proper divisors (1308429445).

1231231221323 is an equidigital number, since it uses as much as digits as its factorization.

1231231221323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308429444.

The product of its digits is 2592, while the sum is 26.

Adding to 1231231221323 its reverse (3231221321321), we get a palindrome (4462452542644).

The spelling of 1231231221323 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty-three".