5521021 has 4 divisors (see below), whose sum is σ = 6022944. Its totient is φ = 5019100.

The previous prime is 5521003. The next prime is 5521051. The reversal of 5521021 is 1201255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5521021 - 2⁹ = 5520509 is a prime.

It is a Duffinian number.

5521021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5520986 and 5521004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5521051) 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, 250945 + ... + 250966.

It is an arithmetic number, because the mean of its divisors is an integer number (1505736).

Almost surely, 2^5521021 is an apocalyptic number.

It is an amenable number.

5521021 is a deficient number, since it is larger than the sum of its proper divisors (501923).

5521021 is a wasteful number, since it uses less digits than its factorization.

5521021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501922.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 5521021 is about 2349.6852980772. The cubic root of 5521021 is about 176.7420140609.

Adding to 5521021 its reverse (1201255), we get a palindrome (6722276).

The spelling of 5521021 in words is "five million, five hundred twenty-one thousand, twenty-one".