213003121 has 4 divisors (see below), whose sum is σ = 213034212. Its totient is φ = 212972032.

The previous prime is 213003103. The next prime is 213003127. The reversal of 213003121 is 121300312.

213003121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 139712400 + 73290721 = 11820^2 + 8561^2 .

It is a cyclic number.

It is not a de Polignac number, because 213003121 - 2¹¹ = 213001073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213003127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256 + ... + 20641.

It is an arithmetic number, because the mean of its divisors is an integer number (53258553).

Almost surely, 2^213003121 is an apocalyptic number.

It is an amenable number.

213003121 is a deficient number, since it is larger than the sum of its proper divisors (31091).

213003121 is a wasteful number, since it uses less digits than its factorization.

213003121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31090.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 213003121 is about 14594.6264426329. The cubic root of 213003121 is about 597.2121788543.

Adding to 213003121 its reverse (121300312), we get a palindrome (334303433).

The spelling of 213003121 in words is "two hundred thirteen million, three thousand, one hundred twenty-one".