21321311221033 has 4 divisors (see below), whose sum is σ = 21329258041168. Its totient is φ = 21313364400900.

The previous prime is 21321311221031. The next prime is 21321311221097. The reversal of 21321311221033 is 33012211312312.

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 21321311221033 - 2¹ = 21321311221031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321311220989 and 21321311221007.

It is not an unprimeable number, because it can be changed into a prime (21321311221031) 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, 3973406043 + ... + 3973411408.

It is an arithmetic number, because the mean of its divisors is an integer number (5332314510292).

Almost surely, 2^{21321311221033} is an apocalyptic number.

It is an amenable number.

21321311221033 is a deficient number, since it is larger than the sum of its proper divisors (7946820135).

21321311221033 is an equidigital number, since it uses as much as digits as its factorization.

21321311221033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7946820134.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21321311221033 its reverse (33012211312312), we get a palindrome (54333522533345).

The spelling of 21321311221033 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred eleven million, two hundred twenty-one thousand, thirty-three".