21221113424343 has 16 divisors (see below), whose sum is σ = 32339068129536. Its totient is φ = 12125550507840.

The previous prime is 21221113424333. The next prime is 21221113424351. The reversal of 21221113424343 is 34342431112212.

It is not a de Polignac number, because 21221113424343 - 2⁸ = 21221113424087 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 33008221 + ... + 33644982.

It is an arithmetic number, because the mean of its divisors is an integer number (2021191758096).

Almost surely, 2^{21221113424343} is an apocalyptic number.

21221113424343 is a deficient number, since it is larger than the sum of its proper divisors (11117954705193).

21221113424343 is a wasteful number, since it uses less digits than its factorization.

21221113424343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66668374.

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

Adding to 21221113424343 its reverse (34342431112212), we get a palindrome (55563544536555).

The spelling of 21221113424343 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirteen million, four hundred twenty-four thousand, three hundred forty-three".