213013321 has 4 divisors (see below), whose sum is σ = 213068052. Its totient is φ = 212958592.

The previous prime is 213013303. The next prime is 213013337. The reversal of 213013321 is 123310312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 194993296 + 18020025 = 13964^2 + 4245^2 .

It is a cyclic number.

It is not a de Polignac number, because 213013321 - 2¹¹ = 213011273 is a prime.

It is a super-4 number, since 4×213013321⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213013295 and 213013304.

It is not an unprimeable number, because it can be changed into a prime (213010321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21040 + ... + 29473.

It is an arithmetic number, because the mean of its divisors is an integer number (53267013).

Almost surely, 2^213013321 is an apocalyptic number.

It is an amenable number.

213013321 is a deficient number, since it is larger than the sum of its proper divisors (54731).

213013321 is an equidigital number, since it uses as much as digits as its factorization.

213013321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54730.

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

The square root of 213013321 is about 14594.9758821315. The cubic root of 213013321 is about 597.2217115268.

Adding to 213013321 its reverse (123310312), we get a palindrome (336323633).

It can be divided in two parts, 2130 and 13321, that added together give a palindrome (15451).

The spelling of 213013321 in words is "two hundred thirteen million, thirteen thousand, three hundred twenty-one".