21104420226 has 16 divisors (see below), whose sum is σ = 42299229024. Its totient is φ = 7019741984.

The previous prime is 21104420191. The next prime is 21104420329. The reversal of 21104420226 is 62202440112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21104420196 and 21104420205.

It is an unprimeable number.

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, 3763155 + ... + 3768758.

It is an arithmetic number, because the mean of its divisors is an integer number (2643701814).

Almost surely, 2^21104420226 is an apocalyptic number.

21104420226 is an abundant number, since it is smaller than the sum of its proper divisors (21194808798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21104420226 is a wasteful number, since it uses less digits than its factorization.

21104420226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7532385.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21104420226 its reverse (62202440112), we get a palindrome (83306860338).

It can be divided in two parts, 21104 and 420226, that added together give a triangular number (441330 = T₉₃₉).

The spelling of 21104420226 in words is "twenty-one billion, one hundred four million, four hundred twenty thousand, two hundred twenty-six".