211997704 has 16 divisors (see below), whose sum is σ = 397959120. Its totient is φ = 105875280.

The previous prime is 211997663. The next prime is 211997707. The reversal of 211997704 is 407799112.

It is not an unprimeable number, because it can be changed into a prime (211997707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7942 + ... + 22069.

It is an arithmetic number, because the mean of its divisors is an integer number (24872445).

Almost surely, 2^211997704 is an apocalyptic number.

It is an amenable number.

211997704 is a deficient number, since it is larger than the sum of its proper divisors (185961416).

211997704 is a wasteful number, since it uses less digits than its factorization.

211997704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30900 (or 30896 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 211997704 is about 14560.1409333839. The cubic root of 211997704 is about 596.2710431829.

The spelling of 211997704 in words is "two hundred eleven million, nine hundred ninety-seven thousand, seven hundred four".