21171314071 has 4 divisors (see below), whose sum is σ = 21380931144. Its totient is φ = 20961697000.

The previous prime is 21171314069. The next prime is 21171314107. The reversal of 21171314071 is 17041317112.

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 21171314071 - 2¹ = 21171314069 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 (21171314371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104808385 + ... + 104808586.

It is an arithmetic number, because the mean of its divisors is an integer number (5345232786).

Almost surely, 2^21171314071 is an apocalyptic number.

21171314071 is a deficient number, since it is larger than the sum of its proper divisors (209617073).

21171314071 is a wasteful number, since it uses less digits than its factorization.

21171314071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209617072.

The product of its (nonzero) digits is 1176, while the sum is 28.

The spelling of 21171314071 in words is "twenty-one billion, one hundred seventy-one million, three hundred fourteen thousand, seventy-one".