7140727721 has 2 divisors, whose sum is σ = 7140727722. Its totient is φ = 7140727720.

The previous prime is 7140727691. The next prime is 7140727723. The reversal of 7140727721 is 1277270417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6419214400 + 721513321 = 80120^2 + 26861^2 .

It is a cyclic number.

It is not a de Polignac number, because 7140727721 - 2²⁶ = 7073618857 is a prime.

Together with 7140727723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7140727723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3570363860 + 3570363861.

It is an arithmetic number, because the mean of its divisors is an integer number (3570363861).

Almost surely, 2^7140727721 is an apocalyptic number.

It is an amenable number.

7140727721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7140727721 is an equidigital number, since it uses as much as digits as its factorization.

7140727721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38416, while the sum is 38.

The square root of 7140727721 is about 84502.8267041997. The cubic root of 7140727721 is about 1925.6653883283.

The spelling of 7140727721 in words is "seven billion, one hundred forty million, seven hundred twenty-seven thousand, seven hundred twenty-one".