2521135231 has 4 divisors (see below), whose sum is σ = 2522805264. Its totient is φ = 2519465200.

The previous prime is 2521135219. The next prime is 2521135247. The reversal of 2521135231 is 1325311252.

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 2521135231 - 2⁷ = 2521135103 is a prime.

It is a super-2 number, since 2×2521135231² = 12712245705978846722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2521135196 and 2521135205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521135931) 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, 832750 + ... + 835771.

It is an arithmetic number, because the mean of its divisors is an integer number (630701316).

Almost surely, 2^2521135231 is an apocalyptic number.

2521135231 is a deficient number, since it is larger than the sum of its proper divisors (1670033).

2521135231 is a wasteful number, since it uses less digits than its factorization.

2521135231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670032.

The product of its digits is 1800, while the sum is 25.

The square root of 2521135231 is about 50210.9074903053. The cubic root of 2521135231 is about 1361.0227368599.

Adding to 2521135231 its reverse (1325311252), we get a palindrome (3846446483).

The spelling of 2521135231 in words is "two billion, five hundred twenty-one million, one hundred thirty-five thousand, two hundred thirty-one".