2670721 has 2 divisors, whose sum is σ = 2670722. Its totient is φ = 2670720.

The previous prime is 2670719. The next prime is 2670739. The reversal of 2670721 is 1270762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2480625 + 190096 = 1575^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 2670721 - 2¹ = 2670719 is a prime.

Together with 2670719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2670761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335360 + 1335361.

It is an arithmetic number, because the mean of its divisors is an integer number (1335361).

2^2670721 is an apocalyptic number.

It is an amenable number.

2670721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2670721 is an equidigital number, since it uses as much as digits as its factorization.

2670721 is an evil number, because the sum of its binary digits is even.

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

The square root of 2670721 is about 1634.2340713619. The cubic root of 2670721 is about 138.7424972271.

The spelling of 2670721 in words is "two million, six hundred seventy thousand, seven hundred twenty-one".