2543020421 has 4 divisors (see below), whose sum is σ = 2549426412. Its totient is φ = 2536614432.

The previous prime is 2543020409. The next prime is 2543020433. The reversal of 2543020421 is 1240203452.

It is a happy number.

2543020421 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.

It is an interprime number because it is at equal distance from previous prime (2543020409) and next prime (2543020433).

It can be written as a sum of positive squares in 2 ways, for example, as 1639116196 + 903904225 = 40486^2 + 30065^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543020421 - 2¹⁰ = 2543019397 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 (2543020451) 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, 3202400 + ... + 3203193.

It is an arithmetic number, because the mean of its divisors is an integer number (637356603).

Almost surely, 2^2543020421 is an apocalyptic number.

It is an amenable number.

2543020421 is a deficient number, since it is larger than the sum of its proper divisors (6405991).

2543020421 is an equidigital number, since it uses as much as digits as its factorization.

2543020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6405990.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 2543020421 is about 50428.3692082145. The cubic root of 2543020421 is about 1364.9496009336.

Adding to 2543020421 its reverse (1240203452), we get a palindrome (3783223873).

The spelling of 2543020421 in words is "two billion, five hundred forty-three million, twenty thousand, four hundred twenty-one".