21451555300255 has 8 divisors (see below), whose sum is σ = 25825716089712. Its totient is φ = 17105344420608.

The previous prime is 21451555300243. The next prime is 21451555300283. The reversal of 21451555300255 is 55200355515412.

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 21451555300255 - 2¹⁹ = 21451554775967 is a prime.

It is a Duffinian number.

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, 6987475762 + ... + 6987478831.

It is an arithmetic number, because the mean of its divisors is an integer number (3228214511214).

Almost surely, 2^{21451555300255} is an apocalyptic number.

21451555300255 is a deficient number, since it is larger than the sum of its proper divisors (4374160789457).

21451555300255 is a wasteful number, since it uses less digits than its factorization.

21451555300255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13974954905.

The product of its (nonzero) digits is 750000, while the sum is 43.

The spelling of 21451555300255 in words is "twenty-one trillion, four hundred fifty-one billion, five hundred fifty-five million, three hundred thousand, two hundred fifty-five".