211897512 has 128 divisors (see below), whose sum is σ = 613267200. Its totient is φ = 67737600.

The previous prime is 211897457. The next prime is 211897523. The reversal of 211897512 is 215798112.

It is a happy number.

211897512 is digitally balanced in base 3, because in such base 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 (36).

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, 628608 + ... + 628944.

It is an arithmetic number, because the mean of its divisors is an integer number (4791150).

Almost surely, 2^211897512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211897512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306633600).

211897512 is an abundant number, since it is smaller than the sum of its proper divisors (401369688).

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

211897512 is a wasteful number, since it uses less digits than its factorization.

211897512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464 (or 454 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 211897512 is about 14556.6999007330. The cubic root of 211897512 is about 596.1770940486.

The spelling of 211897512 in words is "two hundred eleven million, eight hundred ninety-seven thousand, five hundred twelve".