213133444 has 12 divisors (see below), whose sum is σ = 376829404. Its totient is φ = 105467904.

The previous prime is 213133439. The next prime is 213133447. The reversal of 213133444 is 444331312.

213133444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 110880900 + 102252544 = 10530^2 + 10112^2 .

It is a super-2 number, since 2×213133444² = 90851729902602272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213133447) 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, 274269 + ... + 275044.

Almost surely, 2^213133444 is an apocalyptic number.

It is an amenable number.

213133444 is a deficient number, since it is larger than the sum of its proper divisors (163695960).

213133444 is a wasteful number, since it uses less digits than its factorization.

213133444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549414 (or 549412 counting only the distinct ones).

The product of its digits is 3456, while the sum is 25.

The square root of 213133444 is about 14599.0905196180. The cubic root of 213133444 is about 597.3339526804. Note that the first 3 decimals are identical.

Adding to 213133444 its reverse (444331312), we get a palindrome (657464756).

The spelling of 213133444 in words is "two hundred thirteen million, one hundred thirty-three thousand, four hundred forty-four".