2521521231 has 4 divisors (see below), whose sum is σ = 3362028312. Its totient is φ = 1681014152.

The previous prime is 2521521169. The next prime is 2521521253. The reversal of 2521521231 is 1321251252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2521521231 - 2¹⁰ = 2521520207 is a prime.

It is a super-2 number, since 2×2521521231² = 12716138636767510722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521521281) 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, 420253536 + ... + 420253541.

It is an arithmetic number, because the mean of its divisors is an integer number (840507078).

Almost surely, 2^2521521231 is an apocalyptic number.

2521521231 is a deficient number, since it is larger than the sum of its proper divisors (840507081).

2521521231 is an equidigital number, since it uses as much as digits as its factorization.

2521521231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840507080.

The product of its digits is 1200, while the sum is 24.

The square root of 2521521231 is about 50214.7511295237. The cubic root of 2521521231 is about 1361.0921933969.

Adding to 2521521231 its reverse (1321251252), we get a palindrome (3842772483).

The spelling of 2521521231 in words is "two billion, five hundred twenty-one million, five hundred twenty-one thousand, two hundred thirty-one".