211897900 has 36 divisors (see below), whose sum is σ = 463204728. Its totient is φ = 84135040.

The previous prime is 211897897. The next prime is 211897913. The reversal of 211897900 is 9798112.

It is a self number, because there is not a number n which added to its sum of digits gives 211897900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5967 + ... + 21433.

It is an arithmetic number, because the mean of its divisors is an integer number (12866798).

Almost surely, 2^211897900 is an apocalyptic number.

211897900 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 211897900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231602364).

211897900 is an abundant number, since it is smaller than the sum of its proper divisors (251306828).

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

211897900 is a wasteful number, since it uses less digits than its factorization.

211897900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15618 (or 15611 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 211897900 is about 14556.7132279234. The cubic root of 211897900 is about 596.1774579298.

The spelling of 211897900 in words is "two hundred eleven million, eight hundred ninety-seven thousand, nine hundred".