21083569187 has 2 divisors, whose sum is σ = 21083569188. Its totient is φ = 21083569186.

The previous prime is 21083569181. The next prime is 21083569223. The reversal of 21083569187 is 78196538012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21083569187 - 2¹⁴ = 21083552803 is a prime.

It is not a weakly prime, because it can be changed into another prime (21083569181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541784593 + 10541784594.

It is an arithmetic number, because the mean of its divisors is an integer number (10541784594).

Almost surely, 2^21083569187 is an apocalyptic number.

21083569187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21083569187 is an equidigital number, since it uses as much as digits as its factorization.

21083569187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 21083569187 in words is "twenty-one billion, eighty-three million, five hundred sixty-nine thousand, one hundred eighty-seven".