120321521 has 4 divisors (see below), whose sum is σ = 123573492. Its totient is φ = 117069552.

The previous prime is 120321517. The next prime is 120321527. The reversal of 120321521 is 125123021.

It is a happy number.

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 109830400 + 10491121 = 10480^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 120321521 - 2² = 120321517 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 120321521.

It is not an unprimeable number, because it can be changed into a prime (120321527) 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, 1625930 + ... + 1626003.

It is an arithmetic number, because the mean of its divisors is an integer number (30893373).

Almost surely, 2^120321521 is an apocalyptic number.

It is an amenable number.

120321521 is a deficient number, since it is larger than the sum of its proper divisors (3251971).

120321521 is an equidigital number, since it uses as much as digits as its factorization.

120321521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251970.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 120321521 is about 10969.1166918763. The cubic root of 120321521 is about 493.6825436660.

Adding to 120321521 its reverse (125123021), we get a palindrome (245444542).

The spelling of 120321521 in words is "one hundred twenty million, three hundred twenty-one thousand, five hundred twenty-one".