2521421213 has 4 divisors (see below), whose sum is σ = 2521521948. Its totient is φ = 2521320480.

The previous prime is 2521421209. The next prime is 2521421237. The reversal of 2521421213 is 3121241252.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1719512089 + 801909124 = 41467^2 + 28318^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521421213 - 2² = 2521421209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521441213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19295 + ... + 73587.

It is an arithmetic number, because the mean of its divisors is an integer number (630380487).

Almost surely, 2^2521421213 is an apocalyptic number.

It is an amenable number.

2521421213 is a deficient number, since it is larger than the sum of its proper divisors (100735).

2521421213 is an equidigital number, since it uses as much as digits as its factorization.

2521421213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100734.

The product of its digits is 960, while the sum is 23.

The square root of 2521421213 is about 50213.7552170717. The cubic root of 2521421213 is about 1361.0741969169.

Adding to 2521421213 its reverse (3121241252), we get a palindrome (5642662465).

The spelling of 2521421213 in words is "two billion, five hundred twenty-one million, four hundred twenty-one thousand, two hundred thirteen".