123501721273043 has 4 divisors (see below), whose sum is σ = 123501743511240. Its totient is φ = 123501699034848.

The previous prime is 123501721273037. The next prime is 123501721273057. The reversal of 123501721273043 is 340372127105321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 123501721273043 - 2¹⁴ = 123501721256659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123501721272043) 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, 5013296 + ... + 16496562.

It is an arithmetic number, because the mean of its divisors is an integer number (30875435877810).

Almost surely, 2^{123501721273043} is an apocalyptic number.

123501721273043 is a deficient number, since it is larger than the sum of its proper divisors (22238197).

123501721273043 is a wasteful number, since it uses less digits than its factorization.

123501721273043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22238196.

The product of its (nonzero) digits is 211680, while the sum is 41.

Adding to 123501721273043 its reverse (340372127105321), we get a palindrome (463873848378364).

The spelling of 123501721273043 in words is "one hundred twenty-three trillion, five hundred one billion, seven hundred twenty-one million, two hundred seventy-three thousand, forty-three".