522133721 has 2 divisors, whose sum is σ = 522133722. Its totient is φ = 522133720.

The previous prime is 522133681. The next prime is 522133769. The reversal of 522133721 is 127331225.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487747225 + 34386496 = 22085^2 + 5864^2 .

It is a cyclic number.

It is not a de Polignac number, because 522133721 - 2¹⁰ = 522132697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (522133321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261066860 + 261066861.

It is an arithmetic number, because the mean of its divisors is an integer number (261066861).

Almost surely, 2^522133721 is an apocalyptic number.

It is an amenable number.

522133721 is a deficient number, since it is larger than the sum of its proper divisors (1).

522133721 is an equidigital number, since it uses as much as digits as its factorization.

522133721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 26.

The square root of 522133721 is about 22850.2455347858. The cubic root of 522133721 is about 805.2435362587.

Adding to 522133721 its reverse (127331225), we get a palindrome (649464946).

The spelling of 522133721 in words is "five hundred twenty-two million, one hundred thirty-three thousand, seven hundred twenty-one".