212171747639 has 8 divisors (see below), whose sum is σ = 221408385120. Its totient is φ = 202936091776.

The previous prime is 212171747633. The next prime is 212171747677. The reversal of 212171747639 is 936747171212.

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 212171747639 - 2¹² = 212171743543 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 (212171747633) 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, 214667 + ... + 685875.

It is an arithmetic number, because the mean of its divisors is an integer number (27676048140).

Almost surely, 2^212171747639 is an apocalyptic number.

212171747639 is a deficient number, since it is larger than the sum of its proper divisors (9236637481).

212171747639 is a wasteful number, since it uses less digits than its factorization.

212171747639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490809.

The product of its digits is 889056, while the sum is 50.

The spelling of 212171747639 in words is "two hundred twelve billion, one hundred seventy-one million, seven hundred forty-seven thousand, six hundred thirty-nine".