10707657721 has 2 divisors, whose sum is σ = 10707657722. Its totient is φ = 10707657720.

The previous prime is 10707657683. The next prime is 10707657761. The reversal of 10707657721 is 12775670701.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5387560000 + 5320097721 = 73400^2 + 72939^2 .

It is a cyclic number.

It is not a de Polignac number, because 10707657721 - 2⁹ = 10707657209 is a prime.

It is a super-2 number, since 2×10707657721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10707657761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5353828860 + 5353828861.

It is an arithmetic number, because the mean of its divisors is an integer number (5353828861).

Almost surely, 2^10707657721 is an apocalyptic number.

It is an amenable number.

10707657721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10707657721 is an equidigital number, since it uses as much as digits as its factorization.

10707657721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144060, while the sum is 43.

The spelling of 10707657721 in words is "ten billion, seven hundred seven million, six hundred fifty-seven thousand, seven hundred twenty-one".