212102243 has 4 divisors (see below), whose sum is σ = 213979368. Its totient is φ = 210225120.

The previous prime is 212102221. The next prime is 212102257. The reversal of 212102243 is 342201212.

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 212102243 - 2⁶ = 212102179 is a prime.

It is a super-2 number, since 2×212102243² = 89974722971262098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212102203) 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 3 ways as a sum of consecutive naturals, for example, 938393 + ... + 938618.

It is an arithmetic number, because the mean of its divisors is an integer number (53494842).

Almost surely, 2^212102243 is an apocalyptic number.

212102243 is a deficient number, since it is larger than the sum of its proper divisors (1877125).

212102243 is a wasteful number, since it uses less digits than its factorization.

212102243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877124.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212102243 is about 14563.7303943736. The cubic root of 212102243 is about 596.3690369101.

Adding to 212102243 its reverse (342201212), we get a palindrome (554303455).

The spelling of 212102243 in words is "two hundred twelve million, one hundred two thousand, two hundred forty-three".