211223012220 has 144 divisors (see below), whose sum is σ = 717847105248. Its totient is φ = 49821626880.

The previous prime is 211223012197. The next prime is 211223012237. The reversal of 211223012220 is 22210322112.

211223012220 is a `hidden beast` number, since 21 + 122 + 301 + 2 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211223012193 and 211223012202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1368339 + ... + 1514858.

It is an arithmetic number, because the mean of its divisors is an integer number (4985049342).

Almost surely, 2^211223012220 is an apocalyptic number.

211223012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211223012220 is an abundant number, since it is smaller than the sum of its proper divisors (506624093028).

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

211223012220 is a wasteful number, since it uses less digits than its factorization.

211223012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883260 (or 2883255 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 211223012220 its reverse (22210322112), we get a palindrome (233433334332).

The spelling of 211223012220 in words is "two hundred eleven billion, two hundred twenty-three million, twelve thousand, two hundred twenty".