21170737671 has 8 divisors (see below), whose sum is σ = 28293145344. Its totient is φ = 14081077560.

The previous prime is 21170737639. The next prime is 21170737697. The reversal of 21170737671 is 17673707112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21170737671 - 2⁵ = 21170737639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170737271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8185381 + ... + 8187966.

It is an arithmetic number, because the mean of its divisors is an integer number (3536643168).

Almost surely, 2^21170737671 is an apocalyptic number.

21170737671 is a deficient number, since it is larger than the sum of its proper divisors (7122407673).

21170737671 is a wasteful number, since it uses less digits than its factorization.

21170737671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16373781.

The product of its (nonzero) digits is 86436, while the sum is 42.

The spelling of 21170737671 in words is "twenty-one billion, one hundred seventy million, seven hundred thirty-seven thousand, six hundred seventy-one".