123261023821128 has 64 divisors (see below), whose sum is σ = 310451350959360. Its totient is φ = 40780598078976.

The previous prime is 123261023821097. The next prime is 123261023821231. The reversal of 123261023821128 is 821128320162321.

It is a self number, because there is not a number n which added to its sum of digits gives 123261023821128.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17652625 + ... + 23624927.

It is an arithmetic number, because the mean of its divisors is an integer number (4850802358740).

Almost surely, 2^{123261023821128} is an apocalyptic number.

It is an amenable number.

123261023821128 is an abundant number, since it is smaller than the sum of its proper divisors (187190327138232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123261023821128 is a wasteful number, since it uses less digits than its factorization.

123261023821128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5978726 (or 5978722 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

Adding to 123261023821128 its reverse (821128320162321), we get a palindrome (944389343983449).

The spelling of 123261023821128 in words is "one hundred twenty-three trillion, two hundred sixty-one billion, twenty-three million, eight hundred twenty-one thousand, one hundred twenty-eight".