21302123220211 has 4 divisors (see below), whose sum is σ = 21302134152552. Its totient is φ = 21302112287872.

The previous prime is 21302123220163. The next prime is 21302123220223. The reversal of 21302123220211 is 11202232120312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21302123220211 - 2²³ = 21302114831603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21302123250211) 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, 1659865 + ... + 6734938.

It is an arithmetic number, because the mean of its divisors is an integer number (5325533538138).

Almost surely, 2^{21302123220211} is an apocalyptic number.

21302123220211 is a deficient number, since it is larger than the sum of its proper divisors (10932341).

21302123220211 is an equidigital number, since it uses as much as digits as its factorization.

21302123220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10932340.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21302123220211 its reverse (11202232120312), we get a palindrome (32504355340523).

The spelling of 21302123220211 in words is "twenty-one trillion, three hundred two billion, one hundred twenty-three million, two hundred twenty thousand, two hundred eleven".