21332120011121 has 4 divisors (see below), whose sum is σ = 21543329120244. Its totient is φ = 21120910902000.

The previous prime is 21332120011117. The next prime is 21332120011123. The reversal of 21332120011121 is 12111002123312.

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 16900000343521 + 4432119667600 = 4110961^2 + 2105260^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332120011121 - 2² = 21332120011117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21332120011093 and 21332120011102.

It is not an unprimeable number, because it can be changed into a prime (21332120011123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105604554410 + ... + 105604554611.

It is an arithmetic number, because the mean of its divisors is an integer number (5385832280061).

Almost surely, 2^{21332120011121} is an apocalyptic number.

It is an amenable number.

21332120011121 is a deficient number, since it is larger than the sum of its proper divisors (211209109123).

21332120011121 is a wasteful number, since it uses less digits than its factorization.

21332120011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211209109122.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21332120011121 its reverse (12111002123312), we get a palindrome (33443122134433).

The spelling of 21332120011121 in words is "twenty-one trillion, three hundred thirty-two billion, one hundred twenty million, eleven thousand, one hundred twenty-one".