21201112011071 has 2 divisors, whose sum is σ = 21201112011072. Its totient is φ = 21201112011070.

The previous prime is 21201112011067. The next prime is 21201112011187. The reversal of 21201112011071 is 17011021110212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201112011071 - 2² = 21201112011067 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201112001071) 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, 10600556005535 + 10600556005536.

It is an arithmetic number, because the mean of its divisors is an integer number (10600556005536).

Almost surely, 2^{21201112011071} is an apocalyptic number.

21201112011071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201112011071 is an equidigital number, since it uses as much as digits as its factorization.

21201112011071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 20.

Adding to 21201112011071 its reverse (17011021110212), we get a palindrome (38212133121283).

The spelling of 21201112011071 in words is "twenty-one trillion, two hundred one billion, one hundred twelve million, eleven thousand, seventy-one".