21220311103 has 4 divisors (see below), whose sum is σ = 21220945200. Its totient is φ = 21219677008.

The previous prime is 21220311061. The next prime is 21220311109. The reversal of 21220311103 is 30111302212.

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 21220311103 - 2¹⁷ = 21220180031 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 (21220311109) 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, 263878 + ... + 334771.

It is an arithmetic number, because the mean of its divisors is an integer number (5305236300).

Almost surely, 2^21220311103 is an apocalyptic number.

21220311103 is a deficient number, since it is larger than the sum of its proper divisors (634097).

21220311103 is an equidigital number, since it uses as much as digits as its factorization.

21220311103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634096.

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

Adding to 21220311103 its reverse (30111302212), we get a palindrome (51331613315).

The spelling of 21220311103 in words is "twenty-one billion, two hundred twenty million, three hundred eleven thousand, one hundred three".