21120221202089 has 2 divisors, whose sum is σ = 21120221202090. Its totient is φ = 21120221202088.

The previous prime is 21120221202079. The next prime is 21120221202161. The reversal of 21120221202089 is 98020212202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11171022766864 + 9949198435225 = 3342308^2 + 3154235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120221202089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120221202019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560110601044 + 10560110601045.

It is an arithmetic number, because the mean of its divisors is an integer number (10560110601045).

Almost surely, 2^{21120221202089} is an apocalyptic number.

It is an amenable number.

21120221202089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120221202089 is an equidigital number, since it uses as much as digits as its factorization.

21120221202089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 21120221202089 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, two hundred two thousand, eighty-nine".