21259166711 has 2 divisors, whose sum is σ = 21259166712. Its totient is φ = 21259166710.

The previous prime is 21259166641. The next prime is 21259166713. The reversal of 21259166711 is 11766195212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21259166711 - 2¹⁴ = 21259150327 is a prime.

It is a Sophie Germain prime.

Together with 21259166713, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21259166713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10629583355 + 10629583356.

It is an arithmetic number, because the mean of its divisors is an integer number (10629583356).

Almost surely, 2^21259166711 is an apocalyptic number.

21259166711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21259166711 is an equidigital number, since it uses as much as digits as its factorization.

21259166711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The spelling of 21259166711 in words is "twenty-one billion, two hundred fifty-nine million, one hundred sixty-six thousand, seven hundred eleven".