2542021 has 2 divisors, whose sum is σ = 2542022. Its totient is φ = 2542020.

The previous prime is 2542009. The next prime is 2542037. The reversal of 2542021 is 1202452.

2542021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (2542037) can be obtained adding 2542021 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2217121 + 324900 = 1489^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 2542021 - 2¹³ = 2533829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2541986 and 2542004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2542051) 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, 1271010 + 1271011.

It is an arithmetic number, because the mean of its divisors is an integer number (1271011).

2^2542021 is an apocalyptic number.

It is an amenable number.

2542021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2542021 is an equidigital number, since it uses as much as digits as its factorization.

2542021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2542021 is about 1594.3716630698. The cubic root of 2542021 is about 136.4770766606.

Adding to 2542021 its reverse (1202452), we get a palindrome (3744473).

It can be divided in two parts, 25 and 42021, that multiplied together give a triangular number (1050525 = T₁₄₄₉).

The spelling of 2542021 in words is "two million, five hundred forty-two thousand, twenty-one".