21202233333121 has 4 divisors (see below), whose sum is σ = 21202484459332. Its totient is φ = 21201982206912.

The previous prime is 21202233333109. The next prime is 21202233333257. The reversal of 21202233333121 is 12133333220212.

It is a happy number.

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 11495924238096 + 9706309095025 = 3390564^2 + 3115495^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202233333121 - 2¹⁹ = 21202232808833 is a prime.

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 21202233333121.

It is not an unprimeable number, because it can be changed into a prime (21202233333821) 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, 125436420 + ... + 125605333.

It is an arithmetic number, because the mean of its divisors is an integer number (5300621114833).

Almost surely, 2^{21202233333121} is an apocalyptic number.

It is an amenable number.

21202233333121 is a deficient number, since it is larger than the sum of its proper divisors (251126211).

21202233333121 is an equidigital number, since it uses as much as digits as its factorization.

21202233333121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251126210.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 21202233333121 its reverse (12133333220212), we get a palindrome (33335566553333).

The spelling of 21202233333121 in words is "twenty-one trillion, two hundred two billion, two hundred thirty-three million, three hundred thirty-three thousand, one hundred twenty-one".