21220310211 has 8 divisors (see below), whose sum is σ = 28365017424. Its totient is φ = 14111238240.

The previous prime is 21220310207. The next prime is 21220310219. The reversal of 21220310211 is 11201302212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21220310211 - 2² = 21220310207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220310219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8907420 + ... + 8909801.

It is an arithmetic number, because the mean of its divisors is an integer number (3545627178).

Almost surely, 2^21220310211 is an apocalyptic number.

21220310211 is a deficient number, since it is larger than the sum of its proper divisors (7144707213).

21220310211 is a wasteful number, since it uses less digits than its factorization.

21220310211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17817621.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21220310211 its reverse (11201302212), we get a palindrome (32421612423).

The spelling of 21220310211 in words is "twenty-one billion, two hundred twenty million, three hundred ten thousand, two hundred eleven".