52212221 has 2 divisors, whose sum is σ = 52212222. Its totient is φ = 52212220.

The previous prime is 52212211. The next prime is 52212233. The reversal of 52212221 is 12221225.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 16080100 = 6011^2 + 4010^2 .

It is a cyclic number.

It is not a de Polignac number, because 52212221 - 2¹⁴ = 52195837 is a prime.

It is a super-2 number, since 2×52212221² = 5452232043505682, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52212211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26106110 + 26106111.

It is an arithmetic number, because the mean of its divisors is an integer number (26106111).

Almost surely, 2^52212221 is an apocalyptic number.

It is an amenable number.

52212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

52212221 is an equidigital number, since it uses as much as digits as its factorization.

52212221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 160, while the sum is 17.

The square root of 52212221 is about 7225.8024467875. The cubic root of 52212221 is about 373.7581939494.

Adding to 52212221 its reverse (12221225), we get a palindrome (64433446).

The spelling of 52212221 in words is "fifty-two million, two hundred twelve thousand, two hundred twenty-one".