213021331 has 8 divisors (see below), whose sum is σ = 233982720. Its totient is φ = 193034952.

The previous prime is 213021317. The next prime is 213021337. The reversal of 213021331 is 133120312.

213021331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213021331 - 2⁵ = 213021299 is a prime.

It is a super-2 number, since 2×213021331² = 90756174922023122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213021337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243295 + ... + 244168.

It is an arithmetic number, because the mean of its divisors is an integer number (29247840).

Almost surely, 2^213021331 is an apocalyptic number.

213021331 is a deficient number, since it is larger than the sum of its proper divisors (20961389).

213021331 is a wasteful number, since it uses less digits than its factorization.

213021331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487505.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 213021331 is about 14595.2502890495. The cubic root of 213021331 is about 597.2291972652.

Adding to 213021331 its reverse (133120312), we get a palindrome (346141643).

The spelling of 213021331 in words is "two hundred thirteen million, twenty-one thousand, three hundred thirty-one".