123321121431 has 4 divisors (see below), whose sum is σ = 164428161912. Its totient is φ = 82214080952.

The previous prime is 123321121381. The next prime is 123321121439. The reversal of 123321121431 is 134121123321.

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

It is a cyclic number.

It is not a de Polignac number, because 123321121431 - 2²⁷ = 123186903703 is a prime.

It is a super-2 number, since 2×123321121431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123321121439) 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, 20553520236 + ... + 20553520241.

It is an arithmetic number, because the mean of its divisors is an integer number (41107040478).

Almost surely, 2^123321121431 is an apocalyptic number.

123321121431 is a deficient number, since it is larger than the sum of its proper divisors (41107040481).

123321121431 is an equidigital number, since it uses as much as digits as its factorization.

123321121431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41107040480.

The product of its digits is 864, while the sum is 24.

Adding to 123321121431 its reverse (134121123321), we get a palindrome (257442244752).

The spelling of 123321121431 in words is "one hundred twenty-three billion, three hundred twenty-one million, one hundred twenty-one thousand, four hundred thirty-one".