7210711500721 has 2 divisors, whose sum is σ = 7210711500722. Its totient is φ = 7210711500720.

The previous prime is 7210711500701. The next prime is 7210711500749. The reversal of 7210711500721 is 1270051170127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6713177360400 + 497534140321 = 2590980^2 + 705361^2 .

It is an emirp because it is prime and its reverse (1270051170127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7210711500721 - 2⁵ = 7210711500689 is a prime.

It is not a weakly prime, because it can be changed into another prime (7210711500701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3605355750360 + 3605355750361.

It is an arithmetic number, because the mean of its divisors is an integer number (3605355750361).

Almost surely, 2^{7210711500721} is an apocalyptic number.

It is an amenable number.

7210711500721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7210711500721 is an equidigital number, since it uses as much as digits as its factorization.

7210711500721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6860, while the sum is 34.

Adding to 7210711500721 its reverse (1270051170127), we get a palindrome (8480762670848).

The spelling of 7210711500721 in words is "seven trillion, two hundred ten billion, seven hundred eleven million, five hundred thousand, seven hundred twenty-one".