211204022220 has 216 divisors, whose sum is σ = 657589317840. Its totient is φ = 54855636480.

The previous prime is 211204022207. The next prime is 211204022257. The reversal of 211204022220 is 22220402112.

211204022220 is a `hidden beast` number, since 21 + 1 + 20 + 402 + 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 = 211204022193 and 211204022202.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 130452571 + ... + 130454189.

It is an arithmetic number, because the mean of its divisors is an integer number (3044394990).

Almost surely, 2^211204022220 is an apocalyptic number.

211204022220 is a gapful number since it is divisible by the number (20) 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 211204022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328794658920).

211204022220 is an abundant number, since it is smaller than the sum of its proper divisors (446385295620).

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

211204022220 is a wasteful number, since it uses less digits than its factorization.

211204022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 211204022220 its reverse (22220402112), we get a palindrome (233424424332).

The spelling of 211204022220 in words is "two hundred eleven billion, two hundred four million, twenty-two thousand, two hundred twenty".