213044032121 has 4 divisors (see below), whose sum is σ = 214929377652. Its totient is φ = 211158686592.

The previous prime is 213044032111. The next prime is 213044032151. The reversal of 213044032121 is 121230440312.

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 3956410000 + 209087622121 = 62900^2 + 457261^2 .

It is a cyclic number.

It is not a de Polignac number, because 213044032121 - 2¹⁸ = 213043769977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213044032111) 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, 942672596 + ... + 942672821.

It is an arithmetic number, because the mean of its divisors is an integer number (53732344413).

Almost surely, 2^213044032121 is an apocalyptic number.

It is an amenable number.

213044032121 is a deficient number, since it is larger than the sum of its proper divisors (1885345531).

213044032121 is a wasteful number, since it uses less digits than its factorization.

213044032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885345530.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 213044032121 its reverse (121230440312), we get a palindrome (334274472433).

The spelling of 213044032121 in words is "two hundred thirteen billion, forty-four million, thirty-two thousand, one hundred twenty-one".