213240452 has 24 divisors (see below), whose sum is σ = 412304256. Its totient is φ = 95984768.

The previous prime is 213240437. The next prime is 213240473. The reversal of 213240452 is 254042312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 66608 + ... + 69735.

It is an arithmetic number, because the mean of its divisors is an integer number (17179344).

Almost surely, 2^213240452 is an apocalyptic number.

It is an amenable number.

213240452 is a deficient number, since it is larger than the sum of its proper divisors (199063804).

213240452 is a wasteful number, since it uses less digits than its factorization.

213240452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136387 (or 136385 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 213240452 is about 14602.7549455574. The cubic root of 213240452 is about 597.4339038597.

Adding to 213240452 its reverse (254042312), we get a palindrome (467282764).

The spelling of 213240452 in words is "two hundred thirteen million, two hundred forty thousand, four hundred fifty-two".