21176364071 has 4 divisors (see below), whose sum is σ = 21386031144. Its totient is φ = 20966697000.

The previous prime is 21176364059. The next prime is 21176364091. The reversal of 21176364071 is 17046367112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21176364071 - 2¹⁸ = 21176101927 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 (21176364091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104833385 + ... + 104833586.

It is an arithmetic number, because the mean of its divisors is an integer number (5346507786).

Almost surely, 2^21176364071 is an apocalyptic number.

21176364071 is a deficient number, since it is larger than the sum of its proper divisors (209667073).

21176364071 is a wasteful number, since it uses less digits than its factorization.

21176364071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209667072.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 21176364071 in words is "twenty-one billion, one hundred seventy-six million, three hundred sixty-four thousand, seventy-one".