211231355412 has 144 divisors (see below), whose sum is σ = 625746401280. Its totient is φ = 54840542400.

The previous prime is 211231355411. The next prime is 211231355441. The reversal of 211231355412 is 214553132112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 211231355412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211231355411) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17580487 + ... + 17592497.

It is an arithmetic number, because the mean of its divisors is an integer number (4345461120).

Almost surely, 2^211231355412 is an apocalyptic number.

211231355412 is a gapful number since it is divisible by the number (22) 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 211231355412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312873200640).

211231355412 is an abundant number, since it is smaller than the sum of its proper divisors (414515045868).

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

211231355412 is a wasteful number, since it uses less digits than its factorization.

211231355412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14762 (or 14753 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

Adding to 211231355412 its reverse (214553132112), we get a palindrome (425784487524).

The spelling of 211231355412 in words is "two hundred eleven billion, two hundred thirty-one million, three hundred fifty-five thousand, four hundred twelve".