5520421 has 2 divisors, whose sum is σ = 5520422. Its totient is φ = 5520420.

The previous prime is 5520401. The next prime is 5520457. The reversal of 5520421 is 1240255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5239521 + 280900 = 2289^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 5520421 - 2⁷ = 5520293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5520401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2760210 + 2760211.

It is an arithmetic number, because the mean of its divisors is an integer number (2760211).

Almost surely, 2^5520421 is an apocalyptic number.

It is an amenable number.

5520421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5520421 is an equidigital number, since it uses as much as digits as its factorization.

5520421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 5520421 is about 2349.5576179358. The cubic root of 5520421 is about 176.7356113170.

Adding to 5520421 its reverse (1240255), we get a palindrome (6760676).

It can be divided in two parts, 55204 and 21, that added together give a square (55225 = 235²).

The spelling of 5520421 in words is "five million, five hundred twenty thousand, four hundred twenty-one".