123212123431 has 4 divisors (see below), whose sum is σ = 123301864152. Its totient is φ = 123122382712.

The previous prime is 123212123413. The next prime is 123212123471. The reversal of 123212123431 is 134321212321.

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 123212123431 - 2⁵ = 123212123399 is a prime.

It is a super-2 number, since 2×123212123431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123212123396 and 123212123405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123212123471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44868301 + ... + 44871046.

It is an arithmetic number, because the mean of its divisors is an integer number (30825466038).

Almost surely, 2^123212123431 is an apocalyptic number.

123212123431 is a deficient number, since it is larger than the sum of its proper divisors (89740721).

123212123431 is an equidigital number, since it uses as much as digits as its factorization.

123212123431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89740720.

The product of its digits is 1728, while the sum is 25.

Adding to 123212123431 its reverse (134321212321), we get a palindrome (257533335752).

The spelling of 123212123431 in words is "one hundred twenty-three billion, two hundred twelve million, one hundred twenty-three thousand, four hundred thirty-one".