21194262711889 has 2 divisors, whose sum is σ = 21194262711890. Its totient is φ = 21194262711888.

The previous prime is 21194262711821. The next prime is 21194262711917. The reversal of 21194262711889 is 98811726249112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13128049260225 + 8066213451664 = 3623265^2 + 2840108^2 .

It is a cyclic number.

It is not a de Polignac number, because 21194262711889 - 2¹³ = 21194262703697 is a prime.

It is not a weakly prime, because it can be changed into another prime (21194262721889) 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, 10597131355944 + 10597131355945.

It is an arithmetic number, because the mean of its divisors is an integer number (10597131355945).

Almost surely, 2^{21194262711889} is an apocalyptic number.

It is an amenable number.

21194262711889 is a deficient number, since it is larger than the sum of its proper divisors (1).

21194262711889 is an equidigital number, since it uses as much as digits as its factorization.

21194262711889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 61.

The spelling of 21194262711889 in words is "twenty-one trillion, one hundred ninety-four billion, two hundred sixty-two million, seven hundred eleven thousand, eight hundred eighty-nine".