21226524405446 has 4 divisors (see below), whose sum is σ = 31839786608172. Its totient is φ = 10613262202722.

The previous prime is 21226524405397. The next prime is 21226524405461. The reversal of 21226524405446 is 64450442562212.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21226524405446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5306631101360 + ... + 5306631101363.

It is an arithmetic number, because the mean of its divisors is an integer number (7959946652043).

Almost surely, 2^{21226524405446} is an apocalyptic number.

21226524405446 is a deficient number, since it is larger than the sum of its proper divisors (10613262202726).

21226524405446 is a wasteful number, since it uses less digits than its factorization.

21226524405446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10613262202725.

The product of its (nonzero) digits is 3686400, while the sum is 47.

Adding to 21226524405446 its reverse (64450442562212), we get a palindrome (85676966967658).

The spelling of 21226524405446 in words is "twenty-one trillion, two hundred twenty-six billion, five hundred twenty-four million, four hundred five thousand, four hundred forty-six".