211213243 has 4 divisors (see below), whose sum is σ = 211245808. Its totient is φ = 211180680.

The previous prime is 211213241. The next prime is 211213259. The reversal of 211213243 is 342312112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211213243 - 2¹ = 211213241 is a prime.

It is a super-2 number, since 2×211213243² = 89222068037154098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211213243.

It is not an unprimeable number, because it can be changed into a prime (211213241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2871 + ... + 20752.

It is an arithmetic number, because the mean of its divisors is an integer number (52811452).

Almost surely, 2^211213243 is an apocalyptic number.

211213243 is a deficient number, since it is larger than the sum of its proper divisors (32565).

211213243 is an equidigital number, since it uses as much as digits as its factorization.

211213243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32564.

The product of its digits is 288, while the sum is 19.

The square root of 211213243 is about 14533.1773194990. The cubic root of 211213243 is about 595.5346680501.

Adding to 211213243 its reverse (342312112), we get a palindrome (553525355).

The spelling of 211213243 in words is "two hundred eleven million, two hundred thirteen thousand, two hundred forty-three".