2440545021 has 6 divisors (see below), whose sum is σ = 3525231710. Its totient is φ = 1627030008.

The previous prime is 2440545017. The next prime is 2440545043. The reversal of 2440545021 is 1205450442.

It can be written as a sum of positive squares in only one way, i.e., 1717688025 + 722856996 = 41445^2 + 26886^2 .

It is not a de Polignac number, because 2440545021 - 2² = 2440545017 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 (2440545071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 135585826 + ... + 135585843.

Almost surely, 2^2440545021 is an apocalyptic number.

It is an amenable number.

2440545021 is a deficient number, since it is larger than the sum of its proper divisors (1084686689).

2440545021 is a wasteful number, since it uses less digits than its factorization.

2440545021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271171675 (or 271171672 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 2440545021 is about 49401.8726466923. The cubic root of 2440545021 is about 1346.3633299224.

Adding to 2440545021 its reverse (1205450442), we get a palindrome (3645995463).

The spelling of 2440545021 in words is "two billion, four hundred forty million, five hundred forty-five thousand, twenty-one".