21466332109 has 2 divisors, whose sum is σ = 21466332110. Its totient is φ = 21466332108.

The previous prime is 21466332103. The next prime is 21466332113. The reversal of 21466332109 is 90123366412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11663352009 + 9802980100 = 107997^2 + 99010^2 .

It is a cyclic number.

It is not a de Polignac number, because 21466332109 - 2¹⁵ = 21466299341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21466332103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10733166054 + 10733166055.

It is an arithmetic number, because the mean of its divisors is an integer number (10733166055).

Almost surely, 2^21466332109 is an apocalyptic number.

It is an amenable number.

21466332109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21466332109 is an equidigital number, since it uses as much as digits as its factorization.

21466332109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 37.

The spelling of 21466332109 in words is "twenty-one billion, four hundred sixty-six million, three hundred thirty-two thousand, one hundred nine".