2521013321 has 4 divisors (see below), whose sum is σ = 2526628500. Its totient is φ = 2515398144.

The previous prime is 2521013303. The next prime is 2521013323. The reversal of 2521013321 is 1233101252.

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 1952667721 + 568345600 = 44189^2 + 23840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2521013321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2521013293 and 2521013302.

It is not an unprimeable number, because it can be changed into a prime (2521013323) 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, 2806916 + ... + 2807813.

It is an arithmetic number, because the mean of its divisors is an integer number (631657125).

Almost surely, 2^2521013321 is an apocalyptic number.

It is an amenable number.

2521013321 is a deficient number, since it is larger than the sum of its proper divisors (5615179).

2521013321 is an equidigital number, since it uses as much as digits as its factorization.

2521013321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5615178.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2521013321 is about 50209.6934963758. The cubic root of 2521013321 is about 1361.0007989971. Note that the first 3 decimals are identical.

Adding to 2521013321 its reverse (1233101252), we get a palindrome (3754114573).

The spelling of 2521013321 in words is "two billion, five hundred twenty-one million, thirteen thousand, three hundred twenty-one".