243213011 has 4 divisors (see below), whose sum is σ = 251058624. Its totient is φ = 235367400.

The previous prime is 243213007. The next prime is 243213013. The reversal of 243213011 is 110312342.

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 243213011 - 2² = 243213007 is a prime.

It is a super-2 number, since 2×243213011² = 118305137439372242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243213013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3922760 + ... + 3922821.

It is an arithmetic number, because the mean of its divisors is an integer number (62764656).

Almost surely, 2^243213011 is an apocalyptic number.

243213011 is a deficient number, since it is larger than the sum of its proper divisors (7845613).

243213011 is an equidigital number, since it uses as much as digits as its factorization.

243213011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7845612.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 243213011 is about 15595.2881025007. The cubic root of 243213011 is about 624.2074314142.

Adding to 243213011 its reverse (110312342), we get a palindrome (353525353).

The spelling of 243213011 in words is "two hundred forty-three million, two hundred thirteen thousand, eleven".