21214445255 has 32 divisors (see below), whose sum is σ = 27502934400. Its totient is φ = 15660908032.

The previous prime is 21214445243. The next prime is 21214445281. The reversal of 21214445255 is 55254441212.

It is a cyclic number.

It is not a de Polignac number, because 21214445255 - 2²² = 21210250951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6258101 + ... + 6261489.

It is an arithmetic number, because the mean of its divisors is an integer number (859466700).

Almost surely, 2^21214445255 is an apocalyptic number.

21214445255 is a deficient number, since it is larger than the sum of its proper divisors (6288489145).

21214445255 is a wasteful number, since it uses less digits than its factorization.

21214445255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5323.

The product of its digits is 64000, while the sum is 35.

Adding to 21214445255 its reverse (55254441212), we get a palindrome (76468886467).

The spelling of 21214445255 in words is "twenty-one billion, two hundred fourteen million, four hundred forty-five thousand, two hundred fifty-five".