211812804 has 72 divisors (see below), whose sum is σ = 623488320. Its totient is φ = 59372352.

The previous prime is 211812803. The next prime is 211812841. The reversal of 211812804 is 408218112.

It is not an unprimeable number, because it can be changed into a prime (211812803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5427 + ... + 21285.

It is an arithmetic number, because the mean of its divisors is an integer number (8659560).

Almost surely, 2^211812804 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 211812804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311744160).

211812804 is an abundant number, since it is smaller than the sum of its proper divisors (411675516).

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

211812804 is a wasteful number, since it uses less digits than its factorization.

211812804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15929 (or 15924 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 211812804 is about 14553.7900218465. The cubic root of 211812804 is about 596.0976410153.

The spelling of 211812804 in words is "two hundred eleven million, eight hundred twelve thousand, eight hundred four".