211971247 has 8 divisors (see below), whose sum is σ = 217123200. Its totient is φ = 206871384.

The previous prime is 211971229. The next prime is 211971259. The reversal of 211971247 is 742179112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211971247 - 2¹⁹ = 211446959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211971217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4723 + ... + 21124.

It is an arithmetic number, because the mean of its divisors is an integer number (27140400).

Almost surely, 2^211971247 is an apocalyptic number.

211971247 is a deficient number, since it is larger than the sum of its proper divisors (5151953).

211971247 is a wasteful number, since it uses less digits than its factorization.

211971247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26045.

The product of its digits is 7056, while the sum is 34.

The square root of 211971247 is about 14559.2323630060. The cubic root of 211971247 is about 596.2462375694.

The spelling of 211971247 in words is "two hundred eleven million, nine hundred seventy-one thousand, two hundred forty-seven".