123312320221 has 4 divisors (see below), whose sum is σ = 128673725472. Its totient is φ = 117950914972.

The previous prime is 123312320213. The next prime is 123312320233. The reversal of 123312320221 is 122023213321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122023213321 = 43 ⋅2837749147.

It is a cyclic number.

It is not a de Polignac number, because 123312320221 - 2³ = 123312320213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123312320192 and 123312320201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123312324221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2680702591 + ... + 2680702636.

It is an arithmetic number, because the mean of its divisors is an integer number (32168431368).

Almost surely, 2^123312320221 is an apocalyptic number.

It is an amenable number.

123312320221 is a deficient number, since it is larger than the sum of its proper divisors (5361405251).

123312320221 is an equidigital number, since it uses as much as digits as its factorization.

123312320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361405250.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 123312320221 its reverse (122023213321), we get a palindrome (245335533542).

The spelling of 123312320221 in words is "one hundred twenty-three billion, three hundred twelve million, three hundred twenty thousand, two hundred twenty-one".