213522333121 has 4 divisors (see below), whose sum is σ = 213525856192. Its totient is φ = 213518810052.

The previous prime is 213522333049. The next prime is 213522333133. The reversal of 213522333121 is 121333225312.

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 213522333121 - 2¹⁹ = 213521808833 is a prime.

It is a super-4 number, since 4×213522333121⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213522333121.

It is not an unprimeable number, because it can be changed into a prime (213522333161) 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, 1669005 + ... + 1792378.

It is an arithmetic number, because the mean of its divisors is an integer number (53381464048).

Almost surely, 2^213522333121 is an apocalyptic number.

It is an amenable number.

213522333121 is a deficient number, since it is larger than the sum of its proper divisors (3523071).

213522333121 is an equidigital number, since it uses as much as digits as its factorization.

213522333121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3523070.

The product of its digits is 6480, while the sum is 28.

Adding to 213522333121 its reverse (121333225312), we get a palindrome (334855558433).

The spelling of 213522333121 in words is "two hundred thirteen billion, five hundred twenty-two million, three hundred thirty-three thousand, one hundred twenty-one".