21211170089 has 2 divisors, whose sum is σ = 21211170090. Its totient is φ = 21211170088.

The previous prime is 21211170059. The next prime is 21211170091. The reversal of 21211170089 is 98007111212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13290170089 + 7921000000 = 115283^2 + 89000^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211170089 - 2²⁸ = 20942734633 is a prime.

Together with 21211170091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21211170059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605585044 + 10605585045.

It is an arithmetic number, because the mean of its divisors is an integer number (10605585045).

Almost surely, 2^21211170089 is an apocalyptic number.

It is an amenable number.

21211170089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211170089 is an equidigital number, since it uses as much as digits as its factorization.

21211170089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 32.

The spelling of 21211170089 in words is "twenty-one billion, two hundred eleven million, one hundred seventy thousand, eighty-nine".