123255552321 has 24 divisors (see below), whose sum is σ = 194907207456. Its totient is φ = 74436359040.

The previous prime is 123255552313. The next prime is 123255552331.

123255552321 is a `hidden beast` number, since 1 + 2 + 32 + 55 + 552 + 3 + 21 = 666.

123255552321 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 123255552321 - 2³ = 123255552313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123255552331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2171640 + ... + 2227673.

It is an arithmetic number, because the mean of its divisors is an integer number (8121133644).

Almost surely, 2^123255552321 is an apocalyptic number.

123255552321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123255552321 is a deficient number, since it is larger than the sum of its proper divisors (71651655135).

123255552321 is a wasteful number, since it uses less digits than its factorization.

123255552321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4399613 (or 4399610 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

It can be divided in two parts, 123255 and 552321, that added together give a palindrome (675576).

The spelling of 123255552321 in words is "one hundred twenty-three billion, two hundred fifty-five million, five hundred fifty-two thousand, three hundred twenty-one".