2543522021 has 4 divisors (see below), whose sum is σ = 2546314944. Its totient is φ = 2540729100.

The previous prime is 2543522017. The next prime is 2543522029. The reversal of 2543522021 is 1202253452.

2543522021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2543522021 - 2² = 2543522017 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 (2543522029) 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, 1395095 + ... + 1396916.

It is an arithmetic number, because the mean of its divisors is an integer number (636578736).

Almost surely, 2^2543522021 is an apocalyptic number.

It is an amenable number.

2543522021 is a deficient number, since it is larger than the sum of its proper divisors (2792923).

2543522021 is an equidigital number, since it uses as much as digits as its factorization.

2543522021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792922.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 2543522021 is about 50433.3423540419. The cubic root of 2543522021 is about 1365.0393385417.

Adding to 2543522021 its reverse (1202253452), we get a palindrome (3745775473).

The spelling of 2543522021 in words is "two billion, five hundred forty-three million, five hundred twenty-two thousand, twenty-one".