2522021 has 2 divisors, whose sum is σ = 2522022. Its totient is φ = 2522020.

The previous prime is 2522017. The next prime is 2522027. The reversal of 2522021 is 1202252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2464900 + 57121 = 1570^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2522021 - 2² = 2522017 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2521987 and 2522005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2522027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1261010 + 1261011.

It is an arithmetic number, because the mean of its divisors is an integer number (1261011).

2^2522021 is an apocalyptic number.

It is an amenable number.

2522021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2522021 is an equidigital number, since it uses as much as digits as its factorization.

2522021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2522021 is about 1588.0872142297. The cubic root of 2522021 is about 136.1182110909.

Adding to 2522021 its reverse (1202252), we get a palindrome (3724273).

The spelling of 2522021 in words is "two million, five hundred twenty-two thousand, twenty-one".