52220021 has 4 divisors (see below), whose sum is σ = 59680032. Its totient is φ = 44760012.

The previous prime is 52220011. The next prime is 52220023. The reversal of 52220021 is 12002225.

52220021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-52220021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52219978 and 52220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52220023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3729995 + ... + 3730008.

It is an arithmetic number, because the mean of its divisors is an integer number (14920008).

Almost surely, 2^52220021 is an apocalyptic number.

It is an amenable number.

52220021 is a deficient number, since it is larger than the sum of its proper divisors (7460011).

52220021 is an equidigital number, since it uses as much as digits as its factorization.

52220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7460010.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 52220021 is about 7226.3421590733. The cubic root of 52220021 is about 373.7768049738.

Adding to 52220021 its reverse (12002225), we get a palindrome (64222246).

The spelling of 52220021 in words is "fifty-two million, two hundred twenty thousand, twenty-one".