2072821 has 2 divisors, whose sum is σ = 2072822. Its totient is φ = 2072820.

The previous prime is 2072809. The next prime is 2072831. The reversal of 2072821 is 1282702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 703921 = 1170^2 + 839^2 .

It is a cyclic number.

It is not a de Polignac number, because 2072821 - 2⁵ = 2072789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2072792 and 2072801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2072801) 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, 1036410 + 1036411.

It is an arithmetic number, because the mean of its divisors is an integer number (1036411).

2^2072821 is an apocalyptic number.

It is an amenable number.

2072821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2072821 is an equidigital number, since it uses as much as digits as its factorization.

2072821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2072821 is about 1439.7294884804. The cubic root of 2072821 is about 127.5030577250.

The spelling of 2072821 in words is "two million, seventy-two thousand, eight hundred twenty-one".