211431073 has 16 divisors (see below), whose sum is σ = 244162944. Its totient is φ = 179343360.

The previous prime is 211431071. The next prime is 211431089. The reversal of 211431073 is 370134112.

It is not a de Polignac number, because 211431073 - 2¹ = 211431071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211431071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379311 + ... + 379867.

It is an arithmetic number, because the mean of its divisors is an integer number (15260184).

Almost surely, 2^211431073 is an apocalyptic number.

It is an amenable number.

211431073 is a deficient number, since it is larger than the sum of its proper divisors (32731871).

211431073 is a wasteful number, since it uses less digits than its factorization.

211431073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 211431073 is about 14540.6696200691. The cubic root of 211431073 is about 595.7393281115.

Adding to 211431073 its reverse (370134112), we get a palindrome (581565185).

The spelling of 211431073 in words is "two hundred eleven million, four hundred thirty-one thousand, seventy-three".