21455032013255 has 8 divisors (see below), whose sum is σ = 25746075897072. Its totient is φ = 17164000623168.

The previous prime is 21455032013209. The next prime is 21455032013257. The reversal of 21455032013255 is 55231023055412.

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 21455032013255 - 2²⁶ = 21454964904391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455032013257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1198124 + ... + 6659246.

It is an arithmetic number, because the mean of its divisors is an integer number (3218259487134).

Almost surely, 2^{21455032013255} is an apocalyptic number.

21455032013255 is a deficient number, since it is larger than the sum of its proper divisors (4291043883817).

21455032013255 is an equidigital number, since it uses as much as digits as its factorization.

21455032013255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6246865.

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 21455032013255 its reverse (55231023055412), we get a palindrome (76686055068667).

The spelling of 21455032013255 in words is "twenty-one trillion, four hundred fifty-five billion, thirty-two million, thirteen thousand, two hundred fifty-five".