123121321 has 4 divisors (see below), whose sum is σ = 123349444. Its totient is φ = 122893200.

The previous prime is 123121309. The next prime is 123121333.

123121321 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (123121309) and next prime (123121333).

It can be written as a sum of positive squares in 2 ways, for example, as 69538921 + 53582400 = 8339^2 + 7320^2 .

It is a cyclic number.

It is not a de Polignac number, because 123121321 - 2²⁵ = 89566889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123121295 and 123121304.

It is not an unprimeable number, because it can be changed into a prime (123121301) 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, 113250 + ... + 114331.

It is an arithmetic number, because the mean of its divisors is an integer number (30837361).

Almost surely, 2^123121321 is an apocalyptic number.

It is an amenable number.

123121321 is a deficient number, since it is larger than the sum of its proper divisors (228123).

123121321 is an equidigital number, since it uses as much as digits as its factorization.

123121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228122.

The product of its digits is 72, while the sum is 16.

The square root of 123121321 is about 11096.0047314337. The cubic root of 123121321 is about 497.4824397226.

The spelling of 123121321 in words is "one hundred twenty-three million, one hundred twenty-one thousand, three hundred twenty-one".