21170227489 has 2 divisors, whose sum is σ = 21170227490. Its totient is φ = 21170227488.

The previous prime is 21170227471. The next prime is 21170227511. The reversal of 21170227489 is 98472207112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13388341264 + 7781886225 = 115708^2 + 88215^2 .

It is a cyclic number.

It is not a de Polignac number, because 21170227489 - 2⁹ = 21170226977 is a prime.

It is a super-2 number, since 2×21170227489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21170227439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10585113744 + 10585113745.

It is an arithmetic number, because the mean of its divisors is an integer number (10585113745).

Almost surely, 2^21170227489 is an apocalyptic number.

It is an amenable number.

21170227489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21170227489 is an equidigital number, since it uses as much as digits as its factorization.

21170227489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 21170227489 in words is "twenty-one billion, one hundred seventy million, two hundred twenty-seven thousand, four hundred eighty-nine".