21044430255 has 8 divisors (see below), whose sum is σ = 33671088432. Its totient is φ = 11223696128.

The previous prime is 21044430241. The next prime is 21044430283. The reversal of 21044430255 is 55203444012.

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 21044430255 - 2¹⁵ = 21044397487 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701480994 + ... + 701481023.

It is an arithmetic number, because the mean of its divisors is an integer number (4208886054).

Almost surely, 2^21044430255 is an apocalyptic number.

21044430255 is a deficient number, since it is larger than the sum of its proper divisors (12626658177).

21044430255 is a wasteful number, since it uses less digits than its factorization.

21044430255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402962025.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21044430255 its reverse (55203444012), we get a palindrome (76247874267).

The spelling of 21044430255 in words is "twenty-one billion, forty-four million, four hundred thirty thousand, two hundred fifty-five".