213121310 has 32 divisors (see below), whose sum is σ = 391895712. Its totient is φ = 83427840.

The previous prime is 213121303. The next prime is 213121313. The reversal of 213121310 is 13121312.

213121310 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×213121310² = 90841385552232200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98945 + ... + 101075.

It is an arithmetic number, because the mean of its divisors is an integer number (12246741).

Almost surely, 2^213121310 is an apocalyptic number.

213121310 is a deficient number, since it is larger than the sum of its proper divisors (178774402).

213121310 is a wasteful number, since it uses less digits than its factorization.

213121310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 213121310 is about 14598.6749398704. The cubic root of 213121310 is about 597.3226167655.

Adding to 213121310 its reverse (13121312), we get a palindrome (226242622).

It can be divided in two parts, 21312 and 1310, that added together give a palindrome (22622).

The spelling of 213121310 in words is "two hundred thirteen million, one hundred twenty-one thousand, three hundred ten".