21041344455 has 16 divisors (see below), whose sum is σ = 33680300640. Its totient is φ = 11217333888.

The previous prime is 21041344433. The next prime is 21041344459. The reversal of 21041344455 is 55444314012.

It is a happy number.

It is not a de Polignac number, because 21041344455 - 2¹¹ = 21041342407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041344459) 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, 257752 + ... + 329421.

It is an arithmetic number, because the mean of its divisors is an integer number (2105018790).

Almost surely, 2^21041344455 is an apocalyptic number.

21041344455 is a deficient number, since it is larger than the sum of its proper divisors (12638956185).

21041344455 is a wasteful number, since it uses less digits than its factorization.

21041344455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589570.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 21041344455 its reverse (55444314012), we get a palindrome (76485658467).

The spelling of 21041344455 in words is "twenty-one billion, forty-one million, three hundred forty-four thousand, four hundred fifty-five".