5220021 has 8 divisors (see below), whose sum is σ = 6974944. Its totient is φ = 3472560.

The previous prime is 5220013. The next prime is 5220031. The reversal of 5220021 is 1200225.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5220021 - 2³ = 5220013 is a prime.

It is a Duffinian number.

It is a Curzon number.

5220021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5219979 and 5220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5220001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51 + ... + 3231.

It is an arithmetic number, because the mean of its divisors is an integer number (871868).

Almost surely, 2^5220021 is an apocalyptic number.

It is an amenable number.

5220021 is a deficient number, since it is larger than the sum of its proper divisors (1754923).

5220021 is a wasteful number, since it uses less digits than its factorization.

5220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3731.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 5220021 is about 2284.7365274797. The cubic root of 5220021 is about 173.4698821283.

Adding to 5220021 its reverse (1200225), we get a palindrome (6420246).

The spelling of 5220021 in words is "five million, two hundred twenty thousand, twenty-one".