2521921313 has 4 divisors (see below), whose sum is σ = 2569504788. Its totient is φ = 2474337840.

The previous prime is 2521921249. The next prime is 2521921343. The reversal of 2521921313 is 3131291252.

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 1567605649 + 954315664 = 39593^2 + 30892^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521921313 - 2⁶ = 2521921249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521921343) 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, 23791658 + ... + 23791763.

It is an arithmetic number, because the mean of its divisors is an integer number (642376197).

Almost surely, 2^2521921313 is an apocalyptic number.

It is an amenable number.

2521921313 is a deficient number, since it is larger than the sum of its proper divisors (47583475).

2521921313 is an equidigital number, since it uses as much as digits as its factorization.

2521921313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47583474.

The product of its digits is 3240, while the sum is 29.

The square root of 2521921313 is about 50218.7346813916. The cubic root of 2521921313 is about 1361.1641763573.

The spelling of 2521921313 in words is "two billion, five hundred twenty-one million, nine hundred twenty-one thousand, three hundred thirteen".