21767273189 has 2 divisors, whose sum is σ = 21767273190. Its totient is φ = 21767273188.

The previous prime is 21767273153. The next prime is 21767273219. The reversal of 21767273189 is 98137276712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21570796900 + 196476289 = 146870^2 + 14017^2 .

It is a cyclic number.

It is not a de Polignac number, because 21767273189 - 2²⁸ = 21498837733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21767273189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21767273089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10883636594 + 10883636595.

It is an arithmetic number, because the mean of its divisors is an integer number (10883636595).

Almost surely, 2^21767273189 is an apocalyptic number.

It is an amenable number.

21767273189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21767273189 is an equidigital number, since it uses as much as digits as its factorization.

21767273189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 53.

The spelling of 21767273189 in words is "twenty-one billion, seven hundred sixty-seven million, two hundred seventy-three thousand, one hundred eighty-nine".