211203220 has 12 divisors (see below), whose sum is σ = 443526804. Its totient is φ = 84481280.

The previous prime is 211203191. The next prime is 211203233. The reversal of 211203220 is 22302112.

It can be written as a sum of positive squares in 2 ways, for example, as 100280196 + 110923024 = 10014^2 + 10532^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211203220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5280061 + ... + 5280100.

It is an arithmetic number, because the mean of its divisors is an integer number (36960567).

Almost surely, 2^211203220 is an apocalyptic number.

211203220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211203220 is an abundant number, since it is smaller than the sum of its proper divisors (232323584).

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

211203220 is a wasteful number, since it uses less digits than its factorization.

211203220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560170 (or 10560168 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 211203220 is about 14532.8324837246. The cubic root of 211203220 is about 595.5252476522.

Adding to 211203220 its reverse (22302112), we get a palindrome (233505332).

The spelling of 211203220 in words is "two hundred eleven million, two hundred three thousand, two hundred twenty".