522122021 has 2 divisors, whose sum is σ = 522122022. Its totient is φ = 522122020.

The previous prime is 522121991. The next prime is 522122023. The reversal of 522122021 is 120221225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473541121 + 48580900 = 21761^2 + 6970^2 .

It is a cyclic number.

It is not a de Polignac number, because 522122021 - 2¹⁴ = 522105637 is a prime.

It is a super-2 number, since 2×522122021² = 545222809626248882, which contains 22 as substring.

Together with 522122023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (522122023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261061010 + 261061011.

It is an arithmetic number, because the mean of its divisors is an integer number (261061011).

Almost surely, 2^522122021 is an apocalyptic number.

It is an amenable number.

522122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

522122021 is an equidigital number, since it uses as much as digits as its factorization.

522122021 is an evil number, because the sum of its binary digits is even.

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

The square root of 522122021 is about 22849.9895185972. The cubic root of 522122021 is about 805.2375215672.

Adding to 522122021 its reverse (120221225), we get a palindrome (642343246).

The spelling of 522122021 in words is "five hundred twenty-two million, one hundred twenty-two thousand, twenty-one".