2521231 has 4 divisors (see below), whose sum is σ = 2608200. Its totient is φ = 2434264.

The previous prime is 2521223. The next prime is 2521249. The reversal of 2521231 is 1321252.

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 2521231 - 2³ = 2521223 is a prime.

It is a super-2 number, since 2×2521231² = 12713211510722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521271) 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, 43441 + ... + 43498.

It is an arithmetic number, because the mean of its divisors is an integer number (652050).

2^2521231 is an apocalyptic number.

2521231 is a deficient number, since it is larger than the sum of its proper divisors (86969).

2521231 is an equidigital number, since it uses as much as digits as its factorization.

2521231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86968.

The product of its digits is 120, while the sum is 16.

The square root of 2521231 is about 1587.8384678550. The cubic root of 2521231 is about 136.1039970120.

Adding to 2521231 its reverse (1321252), we get a palindrome (3842483).

The spelling of 2521231 in words is "two million, five hundred twenty-one thousand, two hundred thirty-one".