211531443030 has 128 divisors (see below), whose sum is σ = 567140745600. Its totient is φ = 56103321600.

The previous prime is 211531443007. The next prime is 211531443031. The reversal of 211531443030 is 30344135112.

It is a happy number.

211531443030 is a `hidden beast` number, since 211 + 5 + 3 + 1 + 443 + 0 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 211531442985 and 211531443003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211531443031) 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, 69558310 + ... + 69561350.

It is an arithmetic number, because the mean of its divisors is an integer number (4430787075).

Almost surely, 2^211531443030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211531443030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283570372800).

211531443030 is an abundant number, since it is smaller than the sum of its proper divisors (355609302570).

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

211531443030 is a wasteful number, since it uses less digits than its factorization.

211531443030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4367 (or 4361 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 211531443030 its reverse (30344135112), we get a palindrome (241875578142).

The spelling of 211531443030 in words is "two hundred eleven billion, five hundred thirty-one million, four hundred forty-three thousand, thirty".