21164111889871 has 16 divisors (see below), whose sum is σ = 21517928225280. Its totient is φ = 20811438648000.

The previous prime is 21164111889853. The next prime is 21164111889917. The reversal of 21164111889871 is 17898811146112.

It is a cyclic number.

It is not a de Polignac number, because 21164111889871 - 2²¹ = 21164109792719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164111889821) 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, 103262746 + ... + 103467496.

It is an arithmetic number, because the mean of its divisors is an integer number (1344870514080).

Almost surely, 2^{21164111889871} is an apocalyptic number.

21164111889871 is a deficient number, since it is larger than the sum of its proper divisors (353816335409).

21164111889871 is a wasteful number, since it uses less digits than its factorization.

21164111889871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207534.

The product of its digits is 1548288, while the sum is 58.

The spelling of 21164111889871 in words is "twenty-one trillion, one hundred sixty-four billion, one hundred eleven million, eight hundred eighty-nine thousand, eight hundred seventy-one".