9921201089 has 2 divisors, whose sum is σ = 9921201090. Its totient is φ = 9921201088.

The previous prime is 9921201077. The next prime is 9921201113. The reversal of 9921201089 is 9801021299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8801629489 + 1119571600 = 93817^2 + 33460^2 .

It is an emirp because it is prime and its reverse (9801021299) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9921201089 - 2²⁰ = 9920152513 is a prime.

It is not a weakly prime, because it can be changed into another prime (9921261089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960600544 + 4960600545.

It is an arithmetic number, because the mean of its divisors is an integer number (4960600545).

Almost surely, 2^9921201089 is an apocalyptic number.

It is an amenable number.

9921201089 is a deficient number, since it is larger than the sum of its proper divisors (1).

9921201089 is an equidigital number, since it uses as much as digits as its factorization.

9921201089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 9921201089 is about 99605.2262132866. The cubic root of 9921201089 is about 2148.7608571905.

The spelling of 9921201089 in words is "nine billion, nine hundred twenty-one million, two hundred one thousand, eighty-nine".