212747171685 has 8 divisors (see below), whose sum is σ = 340395474720. Its totient is φ = 113465158224.

The previous prime is 212747171639. The next prime is 212747171723. The reversal of 212747171685 is 586171747212.

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

It is not a de Polignac number, because 212747171685 - 2¹⁰ = 212747170661 is a prime.

It is a super-2 number, since 2×212747171685² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7091572375 + ... + 7091572404.

It is an arithmetic number, because the mean of its divisors is an integer number (42549434340).

Almost surely, 2^212747171685 is an apocalyptic number.

It is an amenable number.

212747171685 is a deficient number, since it is larger than the sum of its proper divisors (127648303035).

212747171685 is a wasteful number, since it uses less digits than its factorization.

212747171685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14183144787.

The product of its digits is 1317120, while the sum is 51.

The spelling of 212747171685 in words is "two hundred twelve billion, seven hundred forty-seven million, one hundred seventy-one thousand, six hundred eighty-five".