2544045221 has 4 divisors (see below), whose sum is σ = 2561119500. Its totient is φ = 2526970944.

The previous prime is 2544045211. The next prime is 2544045241. The reversal of 2544045221 is 1225404452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 709636321 + 1834408900 = 26639^2 + 42830^2 .

It is a cyclic number.

It is not a de Polignac number, because 2544045221 - 2²² = 2539850917 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 (2544045211) 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, 8536916 + ... + 8537213.

It is an arithmetic number, because the mean of its divisors is an integer number (640279875).

Almost surely, 2^2544045221 is an apocalyptic number.

It is an amenable number.

2544045221 is a deficient number, since it is larger than the sum of its proper divisors (17074279).

2544045221 is a wasteful number, since it uses less digits than its factorization.

2544045221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17074278.

The product of its (nonzero) digits is 12800, while the sum is 29.

The square root of 2544045221 is about 50438.5291320038. The cubic root of 2544045221 is about 1365.1329278786.

Adding to 2544045221 its reverse (1225404452), we get a palindrome (3769449673).

The spelling of 2544045221 in words is "two billion, five hundred forty-four million, forty-five thousand, two hundred twenty-one".