21643161226 has 8 divisors (see below), whose sum is σ = 32471184384. Its totient is φ = 10819433100.

The previous prime is 21643161191. The next prime is 21643161349. The reversal of 21643161226 is 62216134612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21643161191 and 21643161200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061130 + ... + 1081333.

It is an arithmetic number, because the mean of its divisors is an integer number (4058898048).

Almost surely, 2^21643161226 is an apocalyptic number.

21643161226 is a deficient number, since it is larger than the sum of its proper divisors (10828023158).

21643161226 is a wasteful number, since it uses less digits than its factorization.

21643161226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147516.

The product of its digits is 20736, while the sum is 34.

Adding to 21643161226 its reverse (62216134612), we get a palindrome (83859295838).

The spelling of 21643161226 in words is "twenty-one billion, six hundred forty-three million, one hundred sixty-one thousand, two hundred twenty-six".