213531303 has 4 divisors (see below), whose sum is σ = 284708408. Its totient is φ = 142354200.

The previous prime is 213531301. The next prime is 213531319. The reversal of 213531303 is 303135312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 213531303 - 2¹ = 213531301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213531303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213531301) 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, 35588548 + ... + 35588553.

It is an arithmetic number, because the mean of its divisors is an integer number (71177102).

Almost surely, 2^213531303 is an apocalyptic number.

213531303 is a deficient number, since it is larger than the sum of its proper divisors (71177105).

213531303 is an equidigital number, since it uses as much as digits as its factorization.

213531303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71177104.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 213531303 is about 14612.7103235505. The cubic root of 213531303 is about 597.7054053566.

Adding to 213531303 its reverse (303135312), we get a palindrome (516666615).

The spelling of 213531303 in words is "two hundred thirteen million, five hundred thirty-one thousand, three hundred three".