123313255510221 has 18 divisors (see below), whose sum is σ = 207199823885262. Its totient is φ = 70464717434160.

The previous prime is 123313255510189. The next prime is 123313255510223. The reversal of 123313255510221 is 122015552313321.

123313255510221 is a `hidden beast` number, since 1 + 2 + 3 + 3 + 132 + 5 + 5 + 510 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 108475120389321 + 14838135120900 = 10415139^2 + 3852030^2 .

It is not a de Polignac number, because 123313255510221 - 2⁵ = 123313255510189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123313255510223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 139810946850 + ... + 139810947731.

It is an arithmetic number, because the mean of its divisors is an integer number (11511101326959).

Almost surely, 2^{123313255510221} is an apocalyptic number.

It is an amenable number.

123313255510221 is a deficient number, since it is larger than the sum of its proper divisors (83886568375041).

123313255510221 is a wasteful number, since it uses less digits than its factorization.

123313255510221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279621894601 (or 279621894591 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 123313255510221 in words is "one hundred twenty-three trillion, three hundred thirteen billion, two hundred fifty-five million, five hundred ten thousand, two hundred twenty-one".