211121300 has 144 divisors (see below), whose sum is σ = 537434352. Its totient is φ = 71270400.

The previous prime is 211121299. The next prime is 211121311. The reversal of 211121300 is 3121112.

It can be written as a sum of positive squares in 24 ways, for example, as 206094736 + 5026564 = 14356^2 + 2242^2 .

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 47 ways as a sum of consecutive naturals, for example, 905984 + ... + 906216.

It is an arithmetic number, because the mean of its divisors is an integer number (3732183).

Almost surely, 2^211121300 is an apocalyptic number.

211121300 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 211121300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268717176).

211121300 is an abundant number, since it is smaller than the sum of its proper divisors (326313052).

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

211121300 is a wasteful number, since it uses less digits than its factorization.

211121300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 211121300 is about 14530.0137646184. The cubic root of 211121300 is about 595.4482416653.

Adding to 211121300 its reverse (3121112), we get a palindrome (214242412).

The spelling of 211121300 in words is "two hundred eleven million, one hundred twenty-one thousand, three hundred".