212135243 has 4 divisors (see below), whose sum is σ = 213754728. Its totient is φ = 210515760.

The previous prime is 212135221. The next prime is 212135269. The reversal of 212135243 is 342531212.

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 212135243 - 2⁶ = 212135179 is a prime.

It is a super-2 number, since 2×212135243² = 90002722645338098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212135213) 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, 809546 + ... + 809807.

It is an arithmetic number, because the mean of its divisors is an integer number (53438682).

Almost surely, 2^212135243 is an apocalyptic number.

212135243 is a deficient number, since it is larger than the sum of its proper divisors (1619485).

212135243 is a wasteful number, since it uses less digits than its factorization.

212135243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619484.

The product of its digits is 1440, while the sum is 23.

The square root of 212135243 is about 14564.8633017959. The cubic root of 212135243 is about 596.3999640664.

Adding to 212135243 its reverse (342531212), we get a palindrome (554666455).

The spelling of 212135243 in words is "two hundred twelve million, one hundred thirty-five thousand, two hundred forty-three".