211231991471688 has 384 divisors, whose sum is σ = 681706299456000. Its totient is φ = 60602174507520.

The previous prime is 211231991471647. The next prime is 211231991471701. The reversal of 211231991471688 is 886174199132112.

211231991471688 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 3 + 19 + 91 + 471 + 68 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 641376756 + ... + 641706012.

It is an arithmetic number, because the mean of its divisors is an integer number (1775276821500).

Almost surely, 2^{211231991471688} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211231991471688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340853149728000).

211231991471688 is an abundant number, since it is smaller than the sum of its proper divisors (470474307984312).

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

211231991471688 is a wasteful number, since it uses less digits than its factorization.

211231991471688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330887 (or 330871 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 63.

The spelling of 211231991471688 in words is "two hundred eleven trillion, two hundred thirty-one billion, nine hundred ninety-one million, four hundred seventy-one thousand, six hundred eighty-eight".