21106513189 has 2 divisors, whose sum is σ = 21106513190. Its totient is φ = 21106513188.

The previous prime is 21106513177. The next prime is 21106513237. The reversal of 21106513189 is 98131560112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17951444289 + 3155068900 = 133983^2 + 56170^2 .

It is a cyclic number.

It is not a de Polignac number, because 21106513189 - 2²⁹ = 20569642277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21106513139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553256594 + 10553256595.

It is an arithmetic number, because the mean of its divisors is an integer number (10553256595).

Almost surely, 2^21106513189 is an apocalyptic number.

It is an amenable number.

21106513189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106513189 is an equidigital number, since it uses as much as digits as its factorization.

21106513189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The spelling of 21106513189 in words is "twenty-one billion, one hundred six million, five hundred thirteen thousand, one hundred eighty-nine".