208621789212671 has 8 divisors (see below), whose sum is σ = 209894926970064. Its totient is φ = 207349424231040.

The previous prime is 208621789212659. The next prime is 208621789212709. The reversal of 208621789212671 is 176212987126802.

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

It is a cyclic number.

It is not a de Polignac number, because 208621789212671 - 2¹⁸ = 208621788950527 is a prime.

It is a super-2 number, since 2×208621789212671² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208621789212601) 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, 192652361 + ... + 193732226.

It is an arithmetic number, because the mean of its divisors is an integer number (26236865871258).

Almost surely, 2^{208621789212671} is an apocalyptic number.

208621789212671 is a deficient number, since it is larger than the sum of its proper divisors (1273137757393).

208621789212671 is a wasteful number, since it uses less digits than its factorization.

208621789212671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386387881.

The product of its (nonzero) digits is 16257024, while the sum is 62.

The spelling of 208621789212671 in words is "two hundred eight trillion, six hundred twenty-one billion, seven hundred eighty-nine million, two hundred twelve thousand, six hundred seventy-one".