124220321 has 4 divisors (see below), whose sum is σ = 124405572. Its totient is φ = 124035072.

The previous prime is 124220297. The next prime is 124220323. The reversal of 124220321 is 123022421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29430625 + 94789696 = 5425^2 + 9736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124220321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 124220321.

It is not an unprimeable number, because it can be changed into a prime (124220323) 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, 91616 + ... + 92961.

It is an arithmetic number, because the mean of its divisors is an integer number (31101393).

Almost surely, 2^124220321 is an apocalyptic number.

It is an amenable number.

124220321 is a deficient number, since it is larger than the sum of its proper divisors (185251).

124220321 is an equidigital number, since it uses as much as digits as its factorization.

124220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185250.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 124220321 is about 11145.4170402009. The cubic root of 124220321 is about 498.9582590590.

Adding to 124220321 its reverse (123022421), we get a palindrome (247242742).

The spelling of 124220321 in words is "one hundred twenty-four million, two hundred twenty thousand, three hundred twenty-one".