21210120322211 has 4 divisors (see below), whose sum is σ = 21526689282312. Its totient is φ = 20893551362112.

The previous prime is 21210120322201. The next prime is 21210120322229. The reversal of 21210120322211 is 11222302101212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21210120322211 - 2³⁸ = 20935242415267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210120322201) 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, 158284479950 + ... + 158284480083.

It is an arithmetic number, because the mean of its divisors is an integer number (5381672320578).

Almost surely, 2^{21210120322211} is an apocalyptic number.

21210120322211 is a deficient number, since it is larger than the sum of its proper divisors (316568960101).

21210120322211 is an equidigital number, since it uses as much as digits as its factorization.

21210120322211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316568960100.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21210120322211 its reverse (11222302101212), we get a palindrome (32432422423423).

The spelling of 21210120322211 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, three hundred twenty-two thousand, two hundred eleven".