123111430421 has 4 divisors (see below), whose sum is σ = 140698777632. Its totient is φ = 105524083212.

The previous prime is 123111430363. The next prime is 123111430427. The reversal of 123111430421 is 124034111321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123111430421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111430427) 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, 8793673595 + ... + 8793673608.

It is an arithmetic number, because the mean of its divisors is an integer number (35174694408).

Almost surely, 2^123111430421 is an apocalyptic number.

It is an amenable number.

123111430421 is a deficient number, since it is larger than the sum of its proper divisors (17587347211).

123111430421 is an equidigital number, since it uses as much as digits as its factorization.

123111430421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17587347210.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 123111430421 its reverse (124034111321), we get a palindrome (247145541742).

The spelling of 123111430421 in words is "one hundred twenty-three billion, one hundred eleven million, four hundred thirty thousand, four hundred twenty-one".