2067721 has 2 divisors, whose sum is σ = 2067722. Its totient is φ = 2067720.

The previous prime is 2067719. The next prime is 2067739. The reversal of 2067721 is 1277602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2062096 + 5625 = 1436^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 2067721 - 2¹ = 2067719 is a prime.

Together with 2067719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2067781) 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, 1033860 + 1033861.

It is an arithmetic number, because the mean of its divisors is an integer number (1033861).

2^2067721 is an apocalyptic number.

It is an amenable number.

2067721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2067721 is an equidigital number, since it uses as much as digits as its factorization.

2067721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 2067721 is about 1437.9572316310. The cubic root of 2067721 is about 127.3984016978.

The spelling of 2067721 in words is "two million, sixty-seven thousand, seven hundred twenty-one".