5220256021 has 4 divisors (see below), whose sum is σ = 5221697344. Its totient is φ = 5218814700.

The previous prime is 5220256009. The next prime is 5220256031. The reversal of 5220256021 is 1206520225.

It is a happy number.

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 5220256021 - 2⁷ = 5220255893 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 (5220256001) 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, 715215 + ... + 722476.

It is an arithmetic number, because the mean of its divisors is an integer number (1305424336).

Almost surely, 2^5220256021 is an apocalyptic number.

It is an amenable number.

5220256021 is a deficient number, since it is larger than the sum of its proper divisors (1441323).

5220256021 is a wasteful number, since it uses less digits than its factorization.

5220256021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441322.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 5220256021 is about 72251.3392332627. The cubic root of 5220256021 is about 1734.7248546733.

Adding to 5220256021 its reverse (1206520225), we get a palindrome (6426776246).

The spelling of 5220256021 in words is "five billion, two hundred twenty million, two hundred fifty-six thousand, twenty-one".