9897737845321 has 2 divisors, whose sum is σ = 9897737845322. Its totient is φ = 9897737845320.

The previous prime is 9897737845297. The next prime is 9897737845367. The reversal of 9897737845321 is 1235487377989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5933413939600 + 3964323905721 = 2435860^2 + 1991061^2 .

It is a cyclic number.

It is not a de Polignac number, because 9897737845321 - 2⁹ = 9897737844809 is a prime.

It is not a weakly prime, because it can be changed into another prime (9897737845621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4948868922660 + 4948868922661.

It is an arithmetic number, because the mean of its divisors is an integer number (4948868922661).

Almost surely, 2^{9897737845321} is an apocalyptic number.

It is an amenable number.

9897737845321 is a deficient number, since it is larger than the sum of its proper divisors (1).

9897737845321 is an equidigital number, since it uses as much as digits as its factorization.

9897737845321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640120320, while the sum is 73.

The spelling of 9897737845321 in words is "nine trillion, eight hundred ninety-seven billion, seven hundred thirty-seven million, eight hundred forty-five thousand, three hundred twenty-one".