8820721241 has 2 divisors, whose sum is σ = 8820721242. Its totient is φ = 8820721240.

The previous prime is 8820721213. The next prime is 8820721249. The reversal of 8820721241 is 1421270288.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8033357641 + 787363600 = 89629^2 + 28060^2 .

It is a cyclic number.

It is not a de Polignac number, because 8820721241 - 2¹⁴ = 8820704857 is a prime.

It is a super-2 number, since 2×8820721241² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8820721249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4410360620 + 4410360621.

It is an arithmetic number, because the mean of its divisors is an integer number (4410360621).

Almost surely, 2^8820721241 is an apocalyptic number.

It is an amenable number.

8820721241 is a deficient number, since it is larger than the sum of its proper divisors (1).

8820721241 is an equidigital number, since it uses as much as digits as its factorization.

8820721241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 8820721241 is about 93918.6948429332. The cubic root of 8820721241 is about 2066.1794246981.

The spelling of 8820721241 in words is "eight billion, eight hundred twenty million, seven hundred twenty-one thousand, two hundred forty-one".