211671571616 has 48 divisors (see below), whose sum is σ = 423622279080. Its totient is φ = 104099143680.

The previous prime is 211671571591. The next prime is 211671571669. The reversal of 211671571616 is 616175176112.

It can be written as a sum of positive squares in 4 ways, for example, as 140628000016 + 71043571600 = 375004^2 + 266540^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256376 + ... + 699336.

Almost surely, 2^211671571616 is an apocalyptic number.

It is an amenable number.

211671571616 is an abundant number, since it is smaller than the sum of its proper divisors (211950707464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211671571616 is a wasteful number, since it uses less digits than its factorization.

211671571616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443217 (or 443209 counting only the distinct ones).

The product of its digits is 105840, while the sum is 44.

The spelling of 211671571616 in words is "two hundred eleven billion, six hundred seventy-one million, five hundred seventy-one thousand, six hundred sixteen".