211131345 has 16 divisors (see below), whose sum is σ = 346050432. Its totient is φ = 109856640.

The previous prime is 211131341. The next prime is 211131373. The reversal of 211131345 is 543131112.

It is not a de Polignac number, because 211131345 - 2² = 211131341 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211131341) 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, 171037 + ... + 172266.

It is an arithmetic number, because the mean of its divisors is an integer number (21628152).

Almost surely, 2^211131345 is an apocalyptic number.

It is an amenable number.

211131345 is a deficient number, since it is larger than the sum of its proper divisors (134919087).

211131345 is a wasteful number, since it uses less digits than its factorization.

211131345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343352.

The product of its digits is 360, while the sum is 21.

The square root of 211131345 is about 14530.3594243226. The cubic root of 211131345 is about 595.4576851823.

Adding to 211131345 its reverse (543131112), we get a palindrome (754262457).

The spelling of 211131345 in words is "two hundred eleven million, one hundred thirty-one thousand, three hundred forty-five".