211321230 has 64 divisors (see below), whose sum is σ = 537200640. Its totient is φ = 53053056.

The previous prime is 211321223. The next prime is 211321241. The reversal of 211321230 is 32123112.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97539 + ... + 99681.

It is an arithmetic number, because the mean of its divisors is an integer number (8393760).

Almost surely, 2^211321230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211321230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268600320).

211321230 is an abundant number, since it is smaller than the sum of its proper divisors (325879410).

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

211321230 is a wasteful number, since it uses less digits than its factorization.

211321230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 211321230 is about 14536.8920337189. The cubic root of 211321230 is about 595.6361437664.

Adding to 211321230 its reverse (32123112), we get a palindrome (243444342).

The spelling of 211321230 in words is "two hundred eleven million, three hundred twenty-one thousand, two hundred thirty".