211232223220 has 12 divisors (see below), whose sum is σ = 443587668804. Its totient is φ = 84492889280.

The previous prime is 211232223203. The next prime is 211232223233. The reversal of 211232223220 is 22322232112.

It can be written as a sum of positive squares in 2 ways, for example, as 114333249424 + 96898973796 = 338132^2 + 311286^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211232223191 and 211232223200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5280805561 + ... + 5280805600.

It is an arithmetic number, because the mean of its divisors is an integer number (36965639067).

Almost surely, 2^211232223220 is an apocalyptic number.

211232223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211232223220 is an abundant number, since it is smaller than the sum of its proper divisors (232355445584).

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

211232223220 is a wasteful number, since it uses less digits than its factorization.

211232223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561611170 (or 10561611168 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 211232223220 its reverse (22322232112), we get a palindrome (233554455332).

The spelling of 211232223220 in words is "two hundred eleven billion, two hundred thirty-two million, two hundred twenty-three thousand, two hundred twenty".