211791000405 has 64 divisors (see below), whose sum is σ = 362463160320. Its totient is φ = 105365836800.

The previous prime is 211791000401. The next prime is 211791000419. The reversal of 211791000405 is 504000197112.

It is not a de Polignac number, because 211791000405 - 2² = 211791000401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211791000401) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8253495 + ... + 8279115.

It is an arithmetic number, because the mean of its divisors is an integer number (5663486880).

Almost surely, 2^211791000405 is an apocalyptic number.

It is an amenable number.

211791000405 is a deficient number, since it is larger than the sum of its proper divisors (150672159915).

211791000405 is a wasteful number, since it uses less digits than its factorization.

211791000405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26302.

The product of its (nonzero) digits is 2520, while the sum is 30.

Adding to 211791000405 its reverse (504000197112), we get a palindrome (715791197517).

The spelling of 211791000405 in words is "two hundred eleven billion, seven hundred ninety-one million, four hundred five", and thus it is an aban number.