8621072321 has 2 divisors, whose sum is σ = 8621072322. Its totient is φ = 8621072320.

The previous prime is 8621072287. The next prime is 8621072377. The reversal of 8621072321 is 1232701268.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5578446721 + 3042625600 = 74689^2 + 55160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8621072321 is a prime.

It is not a weakly prime, because it can be changed into another prime (8621072921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4310536160 + 4310536161.

It is an arithmetic number, because the mean of its divisors is an integer number (4310536161).

Almost surely, 2^8621072321 is an apocalyptic number.

It is an amenable number.

8621072321 is a deficient number, since it is larger than the sum of its proper divisors (1).

8621072321 is an equidigital number, since it uses as much as digits as its factorization.

8621072321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 8621072321 is about 92849.7297842056. The cubic root of 8621072321 is about 2050.4716203035.

Adding to 8621072321 its reverse (1232701268), we get a palindrome (9853773589).

The spelling of 8621072321 in words is "eight billion, six hundred twenty-one million, seventy-two thousand, three hundred twenty-one".