5540420421 has 12 divisors (see below), whose sum is σ = 8003495500. Its totient is φ = 3693306240.

The previous prime is 5540420407. The next prime is 5540420437. The reversal of 5540420421 is 1240240455.

5540420421 is a `hidden beast` number, since 55 + 404 + 204 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2166437025 + 3373983396 = 46545^2 + 58086^2 .

It is not a de Polignac number, because 5540420421 - 2⁶ = 5540420357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5540420621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157251 + ... + 189231.

Almost surely, 2^5540420421 is an apocalyptic number.

It is an amenable number.

5540420421 is a deficient number, since it is larger than the sum of its proper divisors (2463075079).

5540420421 is a wasteful number, since it uses less digits than its factorization.

5540420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51236 (or 51233 counting only the distinct ones).

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

The square root of 5540420421 is about 74434.0004366284. Note that the first 3 decimals coincide. The cubic root of 5540420421 is about 1769.4878044928.

Adding to 5540420421 its reverse (1240240455), we get a palindrome (6780660876).

The spelling of 5540420421 in words is "five billion, five hundred forty million, four hundred twenty thousand, four hundred twenty-one".