211231341220 has 24 divisors (see below), whose sum is σ = 443636384184. Its totient is φ = 84482904576.

The previous prime is 211231341203. The next prime is 211231341283. The reversal of 211231341220 is 22143132112.

It can be written as a sum of positive squares in 4 ways, for example, as 30837467236 + 180393873984 = 175606^2 + 424728^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211231341191 and 211231341200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420837 + ... + 774316.

It is an arithmetic number, because the mean of its divisors is an integer number (18484849341).

Almost surely, 2^211231341220 is an apocalyptic number.

211231341220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211231341220 is an abundant number, since it is smaller than the sum of its proper divisors (232405042964).

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

211231341220 is a wasteful number, since it uses less digits than its factorization.

211231341220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203999 (or 1203997 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 211231341220 its reverse (22143132112), we get a palindrome (233374473332).

The spelling of 211231341220 in words is "two hundred eleven billion, two hundred thirty-one million, three hundred forty-one thousand, two hundred twenty".