7124868721 has 2 divisors, whose sum is σ = 7124868722. Its totient is φ = 7124868720.

The previous prime is 7124868719. The next prime is 7124868757. The reversal of 7124868721 is 1278684217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3898628721 + 3226240000 = 62439^2 + 56800^2 .

It is an emirp because it is prime and its reverse (1278684217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7124868721 - 2¹ = 7124868719 is a prime.

Together with 7124868719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7124868781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3562434360 + 3562434361.

It is an arithmetic number, because the mean of its divisors is an integer number (3562434361).

Almost surely, 2^7124868721 is an apocalyptic number.

It is an amenable number.

7124868721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7124868721 is an equidigital number, since it uses as much as digits as its factorization.

7124868721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 301056, while the sum is 46.

The square root of 7124868721 is about 84408.9374474054. The cubic root of 7124868721 is about 1924.2387473815.

The spelling of 7124868721 in words is "seven billion, one hundred twenty-four million, eight hundred sixty-eight thousand, seven hundred twenty-one".