2007721 has 2 divisors, whose sum is σ = 2007722. Its totient is φ = 2007720.

The previous prime is 2007703. The next prime is 2007737. The reversal of 2007721 is 1277002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1929321 + 78400 = 1389^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 2007721 - 2⁹ = 2007209 is a prime.

It is a super-2 number, since 2×2007721² = 8061887227682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2007701) 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, 1003860 + 1003861.

It is an arithmetic number, because the mean of its divisors is an integer number (1003861).

2^2007721 is an apocalyptic number.

It is an amenable number.

2007721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2007721 is an equidigital number, since it uses as much as digits as its factorization.

2007721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 2007721 is about 1416.9407185906. The cubic root of 2007721 is about 126.1540276409.

It can be divided in two parts, 200 and 7721, that added together give a square (7921 = 89²).

The spelling of 2007721 in words is "two million, seven thousand, seven hundred twenty-one".