211304220 has 96 divisors (see below), whose sum is σ = 653764608. Its totient is φ = 50721792.

The previous prime is 211304209. The next prime is 211304257. The reversal of 211304220 is 22403112.

211304220 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 211304220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18957 + ... + 27963.

It is an arithmetic number, because the mean of its divisors is an integer number (6810048).

Almost surely, 2^211304220 is an apocalyptic number.

211304220 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 211304220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326882304).

211304220 is an abundant number, since it is smaller than the sum of its proper divisors (442460388).

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

211304220 is a wasteful number, since it uses less digits than its factorization.

211304220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9059 (or 9057 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 211304220 is about 14536.3069587843. The cubic root of 211304220 is about 595.6201617113.

Adding to 211304220 its reverse (22403112), we get a palindrome (233707332).

The spelling of 211304220 in words is "two hundred eleven million, three hundred four thousand, two hundred twenty".