213021344 has 12 divisors (see below), whose sum is σ = 419385834. Its totient is φ = 106510656.

The previous prime is 213021337. The next prime is 213021349. The reversal of 213021344 is 443120312.

It can be written as a sum of positive squares in only one way, i.e., 212809744 + 211600 = 14588^2 + 460^2 .

It is not an unprimeable number, because it can be changed into a prime (213021349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328427 + ... + 3328490.

Almost surely, 2^213021344 is an apocalyptic number.

It is an amenable number.

213021344 is a deficient number, since it is larger than the sum of its proper divisors (206364490).

213021344 is an equidigital number, since it uses as much as digits as its factorization.

213021344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656927 (or 6656919 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 213021344 is about 14595.2507343999. The cubic root of 213021344 is about 597.2292094142.

Adding to 213021344 its reverse (443120312), we get a palindrome (656141656).

The spelling of 213021344 in words is "two hundred thirteen million, twenty-one thousand, three hundred forty-four".