213321121 has 8 divisors (see below), whose sum is σ = 230282024. Its totient is φ = 196439040.

The previous prime is 213321107. The next prime is 213321127. The reversal of 213321121 is 121123312.

It can be written as a sum of positive squares in 4 ways, for example, as 36723600 + 176597521 = 6060^2 + 13289^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 213321121 - 2⁵ = 213321089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213321095 and 213321104.

It is not an unprimeable number, because it can be changed into a prime (213321127) 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 7 ways as a sum of consecutive naturals, for example, 14016 + ... + 24961.

It is an arithmetic number, because the mean of its divisors is an integer number (28785253).

Almost surely, 2^213321121 is an apocalyptic number.

It is an amenable number.

213321121 is a deficient number, since it is larger than the sum of its proper divisors (16960903).

213321121 is a wasteful number, since it uses less digits than its factorization.

213321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39411.

The product of its digits is 72, while the sum is 16.

The square root of 213321121 is about 14605.5168001684. The cubic root of 213321121 is about 597.5092309049.

Adding to 213321121 its reverse (121123312), we get a palindrome (334444433).

The spelling of 213321121 in words is "two hundred thirteen million, three hundred twenty-one thousand, one hundred twenty-one".