21170066011 has 2 divisors, whose sum is σ = 21170066012. Its totient is φ = 21170066010.

The previous prime is 21170066003. The next prime is 21170066041. The reversal of 21170066011 is 11066007112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21170066011 - 2³ = 21170066003 is a prime.

It is not a weakly prime, because it can be changed into another prime (21170066041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10585033005 + 10585033006.

It is an arithmetic number, because the mean of its divisors is an integer number (10585033006).

Almost surely, 2^21170066011 is an apocalyptic number.

21170066011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21170066011 is an equidigital number, since it uses as much as digits as its factorization.

21170066011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

The spelling of 21170066011 in words is "twenty-one billion, one hundred seventy million, sixty-six thousand, eleven".