21033122111321 has 4 divisors (see below), whose sum is σ = 21033149074944. Its totient is φ = 21033095147700.

The previous prime is 21033122111303. The next prime is 21033122111341. The reversal of 21033122111321 is 12311122133012.

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 21033122111321 - 2⁶ = 21033122111257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033122111341) 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, 12275765 + ... + 13883826.

It is an arithmetic number, because the mean of its divisors is an integer number (5258287268736).

Almost surely, 2^{21033122111321} is an apocalyptic number.

It is an amenable number.

21033122111321 is a deficient number, since it is larger than the sum of its proper divisors (26963623).

21033122111321 is an equidigital number, since it uses as much as digits as its factorization.

21033122111321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26963622.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21033122111321 its reverse (12311122133012), we get a palindrome (33344244244333).

The spelling of 21033122111321 in words is "twenty-one trillion, thirty-three billion, one hundred twenty-two million, one hundred eleven thousand, three hundred twenty-one".