21711020071 has 16 divisors (see below), whose sum is σ = 23571838080. Its totient is φ = 19877729760.

The previous prime is 21711020017. The next prime is 21711020083. The reversal of 21711020071 is 17002011712.

It is a cyclic number.

It is not a de Polignac number, because 21711020071 - 2⁷ = 21711019943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21711020171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2096376 + ... + 2106706.

It is an arithmetic number, because the mean of its divisors is an integer number (1473239880).

Almost surely, 2^21711020071 is an apocalyptic number.

21711020071 is a deficient number, since it is larger than the sum of its proper divisors (1860818009).

21711020071 is a wasteful number, since it uses less digits than its factorization.

21711020071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11646.

The product of its (nonzero) digits is 196, while the sum is 22.

Adding to 21711020071 its reverse (17002011712), we get a palindrome (38713031783).

The spelling of 21711020071 in words is "twenty-one billion, seven hundred eleven million, twenty thousand, seventy-one".