2521321 has 16 divisors (see below), whose sum is σ = 2963520. Its totient is φ = 2119680.

The previous prime is 2521307. The next prime is 2521327. The reversal of 2521321 is 1231252.

It is a cyclic number.

It is not a de Polignac number, because 2521321 - 2¹¹ = 2519273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2521295 and 2521304.

It is not an unprimeable number, because it can be changed into a prime (2521327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18070 + ... + 18208.

It is an arithmetic number, because the mean of its divisors is an integer number (185220).

2^2521321 is an apocalyptic number.

It is an amenable number.

2521321 is a deficient number, since it is larger than the sum of its proper divisors (442199).

2521321 is a wasteful number, since it uses less digits than its factorization.

2521321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264.

The product of its digits is 120, while the sum is 16.

The square root of 2521321 is about 1587.8668080163. The cubic root of 2521321 is about 136.1056164873.

Adding to 2521321 its reverse (1231252), we get a palindrome (3752573).

The spelling of 2521321 in words is "two million, five hundred twenty-one thousand, three hundred twenty-one".