123121454343 has 16 divisors (see below), whose sum is σ = 165685301760. Its totient is φ = 81319445856.

The previous prime is 123121454321. The next prime is 123121454359. The reversal of 123121454343 is 343454121321.

It is not a de Polignac number, because 123121454343 - 2⁸ = 123121454087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121454383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5406046 + ... + 5428772.

It is an arithmetic number, because the mean of its divisors is an integer number (10355331360).

Almost surely, 2^123121454343 is an apocalyptic number.

123121454343 is a deficient number, since it is larger than the sum of its proper divisors (42563847417).

123121454343 is a wasteful number, since it uses less digits than its factorization.

123121454343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39406.

The product of its digits is 34560, while the sum is 33.

Adding to 123121454343 its reverse (343454121321), we get a palindrome (466575575664).

The spelling of 123121454343 in words is "one hundred twenty-three billion, one hundred twenty-one million, four hundred fifty-four thousand, three hundred forty-three".