21344033121 has 4 divisors (see below), whose sum is σ = 28458710832. Its totient is φ = 14229355412.

The previous prime is 21344033111. The next prime is 21344033141. The reversal of 21344033121 is 12133044312.

It is a happy number.

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 21344033121 - 2¹⁰ = 21344032097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21344033091 and 21344033100.

It is not an unprimeable number, because it can be changed into a prime (21344033111) 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, 3557338851 + ... + 3557338856.

It is an arithmetic number, because the mean of its divisors is an integer number (7114677708).

Almost surely, 2^21344033121 is an apocalyptic number.

It is an amenable number.

21344033121 is a deficient number, since it is larger than the sum of its proper divisors (7114677711).

21344033121 is an equidigital number, since it uses as much as digits as its factorization.

21344033121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114677710.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21344033121 its reverse (12133044312), we get a palindrome (33477077433).

The spelling of 21344033121 in words is "twenty-one billion, three hundred forty-four million, thirty-three thousand, one hundred twenty-one".