21344221255 has 8 divisors (see below), whose sum is σ = 29272074912. Its totient is φ = 14636037408.

The previous prime is 21344221219. The next prime is 21344221271. The reversal of 21344221255 is 55212244312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21344221255 - 2⁷ = 21344221127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304917412 + ... + 304917481.

It is an arithmetic number, because the mean of its divisors is an integer number (3659009364).

Almost surely, 2^21344221255 is an apocalyptic number.

21344221255 is a deficient number, since it is larger than the sum of its proper divisors (7927853657).

21344221255 is an equidigital number, since it uses as much as digits as its factorization.

21344221255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609834905.

The product of its digits is 19200, while the sum is 31.

Adding to 21344221255 its reverse (55212244312), we get a palindrome (76556465567).

The spelling of 21344221255 in words is "twenty-one billion, three hundred forty-four million, two hundred twenty-one thousand, two hundred fifty-five".