21220110331 has 16 divisors (see below), whose sum is σ = 24535802304. Its totient is φ = 17976397824.

The previous prime is 21220110319. The next prime is 21220110337. The reversal of 21220110331 is 13301102212.

It is not a de Polignac number, because 21220110331 - 2²⁵ = 21186555899 is a prime.

It is a super-2 number, since 2×21220110331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220110337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241225 + ... + 317221.

It is an arithmetic number, because the mean of its divisors is an integer number (1533487644).

Almost surely, 2^21220110331 is an apocalyptic number.

21220110331 is a deficient number, since it is larger than the sum of its proper divisors (3315691973).

21220110331 is a wasteful number, since it uses less digits than its factorization.

21220110331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76470.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21220110331 its reverse (13301102212), we get a palindrome (34521212543).

The spelling of 21220110331 in words is "twenty-one billion, two hundred twenty million, one hundred ten thousand, three hundred thirty-one".