2773021 has 2 divisors, whose sum is σ = 2773022. Its totient is φ = 2773020.

The previous prime is 2773019. The next prime is 2773033. The reversal of 2773021 is 1203772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1792921 + 980100 = 1339^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2773021 - 2¹ = 2773019 is a prime.

Together with 2773019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2772983 and 2773001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2773061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1386510 + 1386511.

It is an arithmetic number, because the mean of its divisors is an integer number (1386511).

2^2773021 is an apocalyptic number.

It is an amenable number.

2773021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2773021 is an equidigital number, since it uses as much as digits as its factorization.

2773021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 2773021 is about 1665.2390218824. The cubic root of 2773021 is about 140.4918246025.

Adding to 2773021 its reverse (1203772), we get a palindrome (3976793).

The spelling of 2773021 in words is "two million, seven hundred seventy-three thousand, twenty-one".