21112104425 has 6 divisors (see below), whose sum is σ = 26179009518. Its totient is φ = 16889683520.

The previous prime is 21112104421. The next prime is 21112104427. The reversal of 21112104425 is 52440121112.

It can be written as a sum of positive squares in 3 ways, for example, as 220581904 + 20891522521 = 14852^2 + 144539^2 .

It is not a de Polignac number, because 21112104425 - 2² = 21112104421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112104425.

It is not an unprimeable number, because it can be changed into a prime (21112104421) 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 5 ways as a sum of consecutive naturals, for example, 422242064 + ... + 422242113.

It is an arithmetic number, because the mean of its divisors is an integer number (4363168253).

Almost surely, 2^21112104425 is an apocalyptic number.

21112104425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21112104425 is a deficient number, since it is larger than the sum of its proper divisors (5066905093).

21112104425 is an equidigital number, since it uses as much as digits as its factorization.

21112104425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844484187 (or 844484182 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21112104425 its reverse (52440121112), we get a palindrome (73552225537).

The spelling of 21112104425 in words is "twenty-one billion, one hundred twelve million, one hundred four thousand, four hundred twenty-five".