52228021 has 2 divisors, whose sum is σ = 52228022. Its totient is φ = 52228020.

The previous prime is 52228019. The next prime is 52228037. The reversal of 52228021 is 12082225.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29322225 + 22905796 = 5415^2 + 4786^2 .

It is a cyclic number.

It is not a de Polignac number, because 52228021 - 2¹ = 52228019 is a prime.

Together with 52228019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 52227983 and 52228001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52228061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26114010 + 26114011.

It is an arithmetic number, because the mean of its divisors is an integer number (26114011).

Almost surely, 2^52228021 is an apocalyptic number.

It is an amenable number.

52228021 is a deficient number, since it is larger than the sum of its proper divisors (1).

52228021 is an equidigital number, since it uses as much as digits as its factorization.

52228021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 52228021 is about 7226.8956682659. The cubic root of 52228021 is about 373.7958912789.

The spelling of 52228021 in words is "fifty-two million, two hundred twenty-eight thousand, twenty-one".