21204344103 has 16 divisors (see below), whose sum is σ = 30210190560. Its totient is φ = 13182621696.

The previous prime is 21204344093. The next prime is 21204344111. The reversal of 21204344103 is 30144340212.

It is not a de Polignac number, because 21204344103 - 2⁸ = 21204343847 is a prime.

It is a super-5 number, since 5×21204344103⁵ (a number of 53 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204344123) 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, 1901650 + ... + 1912767.

It is an arithmetic number, because the mean of its divisors is an integer number (1888136910).

Almost surely, 2^21204344103 is an apocalyptic number.

21204344103 is a deficient number, since it is larger than the sum of its proper divisors (9005846457).

21204344103 is a wasteful number, since it uses less digits than its factorization.

21204344103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3814546.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21204344103 its reverse (30144340212), we get a palindrome (51348684315).

The spelling of 21204344103 in words is "twenty-one billion, two hundred four million, three hundred forty-four thousand, one hundred three".