123321261 has 8 divisors (see below), whose sum is σ = 187918144. Its totient is φ = 70469280.

The previous prime is 123321257. The next prime is 123321277. The reversal of 123321261 is 162123321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123321261 - 2² = 123321257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 5872441 = 123321261 / (1 + 2 + 3 + 3 + 2 + 1 + 2 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123321161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2936200 + ... + 2936241.

It is an arithmetic number, because the mean of its divisors is an integer number (23489768).

Almost surely, 2^123321261 is an apocalyptic number.

It is an amenable number.

123321261 is a deficient number, since it is larger than the sum of its proper divisors (64596883).

123321261 is an equidigital number, since it uses as much as digits as its factorization.

123321261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5872451.

The product of its digits is 432, while the sum is 21.

The square root of 123321261 is about 11105.0106258391. The cubic root of 123321261 is about 497.7515857555.

Adding to 123321261 its reverse (162123321), we get a palindrome (285444582).

The spelling of 123321261 in words is "one hundred twenty-three million, three hundred twenty-one thousand, two hundred sixty-one".