213201121 has 4 divisors (see below), whose sum is σ = 243658432. Its totient is φ = 182743812.

The previous prime is 213201103. The next prime is 213201137. The reversal of 213201121 is 121102312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213201121 - 2⁵ = 213201089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213201101) 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, 15228645 + ... + 15228658.

It is an arithmetic number, because the mean of its divisors is an integer number (60914608).

Almost surely, 2^213201121 is an apocalyptic number.

It is an amenable number.

213201121 is a deficient number, since it is larger than the sum of its proper divisors (30457311).

213201121 is an equidigital number, since it uses as much as digits as its factorization.

213201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30457310.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 213201121 is about 14601.4081855142. The cubic root of 213201121 is about 597.3971704952.

Adding to 213201121 its reverse (121102312), we get a palindrome (334303433).

The spelling of 213201121 in words is "two hundred thirteen million, two hundred one thousand, one hundred twenty-one".