7102721 has 2 divisors, whose sum is σ = 7102722. Its totient is φ = 7102720.

The previous prime is 7102703. The next prime is 7102741. The reversal of 7102721 is 1272017.

7102721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (7102741) can be obtained adding 7102721 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3568321 + 3534400 = 1889^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 7102721 - 2¹⁸ = 6840577 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7102693 and 7102702.

It is not a weakly prime, because it can be changed into another prime (7102741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3551360 + 3551361.

It is an arithmetic number, because the mean of its divisors is an integer number (3551361).

Almost surely, 2^7102721 is an apocalyptic number.

It is an amenable number.

7102721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7102721 is an equidigital number, since it uses as much as digits as its factorization.

7102721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 7102721 is about 2665.0930565367. The cubic root of 7102721 is about 192.2242839809.

Adding to 7102721 its reverse (1272017), we get a palindrome (8374738).

The spelling of 7102721 in words is "seven million, one hundred two thousand, seven hundred twenty-one".