123051321 has 24 divisors (see below), whose sum is σ = 194692680. Its totient is φ = 74543616.

The previous prime is 123051317. The next prime is 123051323. The reversal of 123051321 is 123150321.

It can be written as a sum of positive squares in 4 ways, for example, as 18275625 + 104775696 = 4275^2 + 10236^2 .

It is not a de Polignac number, because 123051321 - 2² = 123051317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123051294 and 123051303.

It is not an unprimeable number, because it can be changed into a prime (123051323) 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, 9430 + ... + 18303.

It is an arithmetic number, because the mean of its divisors is an integer number (8112195).

Almost surely, 2^123051321 is an apocalyptic number.

It is an amenable number.

123051321 is a deficient number, since it is larger than the sum of its proper divisors (71641359).

123051321 is a wasteful number, since it uses less digits than its factorization.

123051321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27785 (or 27782 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 123051321 is about 11092.8499944784. The cubic root of 123051321 is about 497.3881414803.

The spelling of 123051321 in words is "one hundred twenty-three million, fifty-one thousand, three hundred twenty-one".