213012403 has 4 divisors (see below), whose sum is σ = 213544008. Its totient is φ = 212480800.

The previous prime is 213012391. The next prime is 213012421. The reversal of 213012403 is 304210312.

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 213012403 - 2⁹ = 213011891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213012433) 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, 265201 + ... + 266002.

It is an arithmetic number, because the mean of its divisors is an integer number (53386002).

Almost surely, 2^213012403 is an apocalyptic number.

213012403 is a deficient number, since it is larger than the sum of its proper divisors (531605).

213012403 is an equidigital number, since it uses as much as digits as its factorization.

213012403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531604.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 213012403 is about 14594.9444329192. The cubic root of 213012403 is about 597.2208535988.

Adding to 213012403 its reverse (304210312), we get a palindrome (517222715).

The spelling of 213012403 in words is "two hundred thirteen million, twelve thousand, four hundred three".