21255254435563 has 8 divisors (see below), whose sum is σ = 21257833713840. Its totient is φ = 21252675348480.

The previous prime is 21255254435557. The next prime is 21255254435573. The reversal of 21255254435563 is 36553445255212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21255254435563 is a prime.

It is a super-2 number, since 2×21255254435563² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21255254435563.

It is not an unprimeable number, because it can be changed into a prime (21255254435573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374533356 + ... + 374590102.

It is an arithmetic number, because the mean of its divisors is an integer number (2657229214230).

Almost surely, 2^{21255254435563} is an apocalyptic number.

21255254435563 is a deficient number, since it is larger than the sum of its proper divisors (2579278277).

21255254435563 is a wasteful number, since it uses less digits than its factorization.

21255254435563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95597.

The product of its digits is 21600000, while the sum is 52.

The spelling of 21255254435563 in words is "twenty-one trillion, two hundred fifty-five billion, two hundred fifty-four million, four hundred thirty-five thousand, five hundred sixty-three".