2544230021 has 4 divisors (see below), whose sum is σ = 2544339372. Its totient is φ = 2544120672.

The previous prime is 2544229973. The next prime is 2544230033. The reversal of 2544230021 is 1200324452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 676780225 + 1867449796 = 26015^2 + 43214^2 .

It is a cyclic number.

It is not a de Polignac number, because 2544230021 - 2²² = 2540035717 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 (2544230041) 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, 4310 + ... + 71463.

It is an arithmetic number, because the mean of its divisors is an integer number (636084843).

Almost surely, 2^2544230021 is an apocalyptic number.

It is an amenable number.

2544230021 is a deficient number, since it is larger than the sum of its proper divisors (109351).

2544230021 is an equidigital number, since it uses as much as digits as its factorization.

2544230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109350.

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

The square root of 2544230021 is about 50440.3610316183. The cubic root of 2544230021 is about 1365.1659815962.

Adding to 2544230021 its reverse (1200324452), we get a palindrome (3744554473).

The spelling of 2544230021 in words is "two billion, five hundred forty-four million, two hundred thirty thousand, twenty-one".