21221113424334 has 16 divisors (see below), whose sum is σ = 42580475148288. Its totient is φ = 7050663091512.

The previous prime is 21221113424333. The next prime is 21221113424351. The reversal of 21221113424334 is 43342431112212.

It is a junction number, because it is equal to n+sod(n) for n = 21221113424295 and 21221113424304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221113424333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5760343822 + ... + 5760347505.

It is an arithmetic number, because the mean of its divisors is an integer number (2661279696768).

Almost surely, 2^{21221113424334} is an apocalyptic number.

21221113424334 is an abundant number, since it is smaller than the sum of its proper divisors (21359361723954).

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

21221113424334 is a wasteful number, since it uses less digits than its factorization.

21221113424334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11520691639.

The product of its digits is 27648, while the sum is 33.

Adding to 21221113424334 its reverse (43342431112212), we get a palindrome (64563544536546).

The spelling of 21221113424334 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirteen million, four hundred twenty-four thousand, three hundred thirty-four".