211312643 has 6 divisors (see below), whose sum is σ = 215377764. Its totient is φ = 207322856.

The previous prime is 211312639. The next prime is 211312649. The reversal of 211312643 is 346213112.

It is not a de Polignac number, because 211312643 - 2² = 211312639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211312649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34805 + ... + 40422.

It is an arithmetic number, because the mean of its divisors is an integer number (35896294).

Almost surely, 2^211312643 is an apocalyptic number.

211312643 is a deficient number, since it is larger than the sum of its proper divisors (4065121).

211312643 is an frugal number, since it uses more digits than its factorization.

211312643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75333 (or 75280 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 211312643 is about 14536.5966787278. The cubic root of 211312643 is about 595.6280758015.

Adding to 211312643 its reverse (346213112), we get a palindrome (557525755).

The spelling of 211312643 in words is "two hundred eleven million, three hundred twelve thousand, six hundred forty-three".