21120101089 has 2 divisors, whose sum is σ = 21120101090. Its totient is φ = 21120101088.

The previous prime is 21120101083. The next prime is 21120101117. The reversal of 21120101089 is 98010102112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14536401489 + 6583699600 = 120567^2 + 81140^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120101089 - 2⁷ = 21120100961 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120101083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560050544 + 10560050545.

It is an arithmetic number, because the mean of its divisors is an integer number (10560050545).

Almost surely, 2^21120101089 is an apocalyptic number.

It is an amenable number.

21120101089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120101089 is an equidigital number, since it uses as much as digits as its factorization.

21120101089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 21120101089 in words is "twenty-one billion, one hundred twenty million, one hundred one thousand, eighty-nine".