21220331103 has 8 divisors (see below), whose sum is σ = 31437527600. Its totient is φ = 14146887384.

The previous prime is 21220331101. The next prime is 21220331123. The reversal of 21220331103 is 30113302212.

21220331103 is a `hidden beast` number, since 212 + 20 + 331 + 103 = 666.

It is not a de Polignac number, because 21220331103 - 2¹ = 21220331101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220331101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392969068 + ... + 392969121.

It is an arithmetic number, because the mean of its divisors is an integer number (3929690950).

Almost surely, 2^21220331103 is an apocalyptic number.

21220331103 is a deficient number, since it is larger than the sum of its proper divisors (10217196497).

21220331103 is an equidigital number, since it uses as much as digits as its factorization.

21220331103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785938198 (or 785938192 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21220331103 its reverse (30113302212), we get a palindrome (51333633315).

The spelling of 21220331103 in words is "twenty-one billion, two hundred twenty million, three hundred thirty-one thousand, one hundred three".