211123030440 has 128 divisors (see below), whose sum is σ = 726879744000. Its totient is φ = 48054736128.

The previous prime is 211123030423. The next prime is 211123030441. The reversal of 211123030440 is 44030321112.

211123030440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (211123030441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 325050 + ... + 726569.

It is an arithmetic number, because the mean of its divisors is an integer number (5678748000).

Almost surely, 2^211123030440 is an apocalyptic number.

211123030440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211123030440 is an abundant number, since it is smaller than the sum of its proper divisors (515756713560).

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

211123030440 is a wasteful number, since it uses less digits than its factorization.

211123030440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051879 (or 1051875 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 211123030440 its reverse (44030321112), we get a palindrome (255153351552).

The spelling of 211123030440 in words is "two hundred eleven billion, one hundred twenty-three million, thirty thousand, four hundred forty".