21204133226 has 4 divisors (see below), whose sum is σ = 31806199842. Its totient is φ = 10602066612.

The previous prime is 21204133193. The next prime is 21204133229. The reversal of 21204133226 is 62233140212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18063091201 + 3141042025 = 134399^2 + 56045^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21204133195 and 21204133204.

It is not an unprimeable number, because it can be changed into a prime (21204133229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5301033305 + ... + 5301033308.

Almost surely, 2^21204133226 is an apocalyptic number.

21204133226 is a deficient number, since it is larger than the sum of its proper divisors (10602066616).

21204133226 is a wasteful number, since it uses less digits than its factorization.

21204133226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10602066615.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21204133226 its reverse (62233140212), we get a palindrome (83437273438).

The spelling of 21204133226 in words is "twenty-one billion, two hundred four million, one hundred thirty-three thousand, two hundred twenty-six".