123021201321 has 24 divisors (see below), whose sum is σ = 184550525640. Its totient is φ = 78900915456.

The previous prime is 123021201241. The next prime is 123021201341. The reversal of 123021201321 is 123102120321.

123021201321 is a `hidden beast` number, since 123 + 0 + 21 + 201 + 321 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1264869225 + 121756332096 = 35565^2 + 348936^2 .

It is not a de Polignac number, because 123021201321 - 2¹³ = 123021193129 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 123021201294 and 123021201303.

It is not an unprimeable number, because it can be changed into a prime (123021201341) 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, 2045830 + ... + 2105103.

It is an arithmetic number, because the mean of its divisors is an integer number (7689605235).

Almost surely, 2^123021201321 is an apocalyptic number.

It is an amenable number.

123021201321 is a deficient number, since it is larger than the sum of its proper divisors (61529324319).

123021201321 is a wasteful number, since it uses less digits than its factorization.

123021201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4151065 (or 4151062 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 123021201321 its reverse (123102120321), we get a palindrome (246123321642).

The spelling of 123021201321 in words is "one hundred twenty-three billion, twenty-one million, two hundred one thousand, three hundred twenty-one".