2053721 has 2 divisors, whose sum is σ = 2053722. Its totient is φ = 2053720.

The previous prime is 2053703. The next prime is 2053757. The reversal of 2053721 is 1273502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1413721 + 640000 = 1189^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 2053721 - 2¹⁰ = 2052697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2053693 and 2053702.

It is not a weakly prime, because it can be changed into another prime (2053771) 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, 1026860 + 1026861.

It is an arithmetic number, because the mean of its divisors is an integer number (1026861).

2^2053721 is an apocalyptic number.

It is an amenable number.

2053721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2053721 is an equidigital number, since it uses as much as digits as its factorization.

2053721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 2053721 is about 1433.0809467717. The cubic root of 2053721 is about 127.1102231970.

The spelling of 2053721 in words is "two million, fifty-three thousand, seven hundred twenty-one".