211031203840 has 112 divisors (see below), whose sum is σ = 506890937448. Its totient is φ = 84338016256.

The previous prime is 211031203807. The next prime is 211031203841. The reversal of 211031203840 is 48302130112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54240546816 + 156790657024 = 232896^2 + 395968^2 .

It is not an unprimeable number, because it can be changed into a prime (211031203841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88185684 + ... + 88188076.

Almost surely, 2^211031203840 is an apocalyptic number.

211031203840 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 211031203840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253445468724).

211031203840 is an abundant number, since it is smaller than the sum of its proper divisors (295859733608).

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

211031203840 is an equidigital number, since it uses as much as digits as its factorization.

211031203840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4577 (or 4553 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 211031203840 its reverse (48302130112), we get a palindrome (259333333952).

The spelling of 211031203840 in words is "two hundred eleven billion, thirty-one million, two hundred three thousand, eight hundred forty".