211123011320 has 128 divisors (see below), whose sum is σ = 530288640000. Its totient is φ = 75121482240.

The previous prime is 211123011317. The next prime is 211123011343. The reversal of 211123011320 is 23110321112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3825281 + ... + 3880079.

It is an arithmetic number, because the mean of its divisors is an integer number (4142880000).

Almost surely, 2^211123011320 is an apocalyptic number.

211123011320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211123011320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265144320000).

211123011320 is an abundant number, since it is smaller than the sum of its proper divisors (319165628680).

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

211123011320 is a wasteful number, since it uses less digits than its factorization.

211123011320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55093 (or 55089 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 211123011320 its reverse (23110321112), we get a palindrome (234233332432).

The spelling of 211123011320 in words is "two hundred eleven billion, one hundred twenty-three million, eleven thousand, three hundred twenty".