52207721 has 2 divisors, whose sum is σ = 52207722. Its totient is φ = 52207720.

The previous prime is 52207717. The next prime is 52207733. The reversal of 52207721 is 12770225.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 4044121 = 6940^2 + 2011^2 .

It is a cyclic number.

It is not a de Polignac number, because 52207721 - 2² = 52207717 is a prime.

It is a super-3 number, since 3×52207721³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (52207711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26103860 + 26103861.

It is an arithmetic number, because the mean of its divisors is an integer number (26103861).

Almost surely, 2^52207721 is an apocalyptic number.

It is an amenable number.

52207721 is a deficient number, since it is larger than the sum of its proper divisors (1).

52207721 is an equidigital number, since it uses as much as digits as its factorization.

52207721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 52207721 is about 7225.4910559767. The cubic root of 52207721 is about 373.7474559768.

Adding to 52207721 its reverse (12770225), we get a palindrome (64977946).

The spelling of 52207721 in words is "fifty-two million, two hundred seven thousand, seven hundred twenty-one".