211323173985 has 96 divisors (see below), whose sum is σ = 480713425920. Its totient is φ = 83200348800.

The previous prime is 211323173969. The next prime is 211323173987. The reversal of 211323173985 is 589371323112.

211323173985 is a `hidden beast` number, since 21 + 1 + 3 + 231 + 7 + 398 + 5 = 666.

It is not a de Polignac number, because 211323173985 - 2⁴ = 211323173969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 211323173985.

It is not an unprimeable number, because it can be changed into a prime (211323173987) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1539111 + ... + 1670780.

It is an arithmetic number, because the mean of its divisors is an integer number (5007431520).

Almost surely, 2^211323173985 is an apocalyptic number.

It is an amenable number.

211323173985 is an abundant number, since it is smaller than the sum of its proper divisors (269390251935).

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

211323173985 is a wasteful number, since it uses less digits than its factorization.

211323173985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209939 (or 3209936 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 211323173985 in words is "two hundred eleven billion, three hundred twenty-three million, one hundred seventy-three thousand, nine hundred eighty-five".