211430871 has 16 divisors (see below), whose sum is σ = 320517120. Its totient is φ = 137675160.

The previous prime is 211430861. The next prime is 211430873. The reversal of 211430871 is 178034112.

It is not a de Polignac number, because 211430871 - 2¹⁰ = 211429847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211430873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89895 + ... + 92216.

It is an arithmetic number, because the mean of its divisors is an integer number (20032320).

Almost surely, 2^211430871 is an apocalyptic number.

211430871 is a deficient number, since it is larger than the sum of its proper divisors (109086249).

211430871 is a wasteful number, since it uses less digits than its factorization.

211430871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182163 (or 182157 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 211430871 is about 14540.6626740324. The cubic root of 211430871 is about 595.7391383895.

Adding to 211430871 its reverse (178034112), we get a palindrome (389464983).

The spelling of 211430871 in words is "two hundred eleven million, four hundred thirty thousand, eight hundred seventy-one".