21255480575 has 12 divisors (see below), whose sum is σ = 30122052720. Its totient is φ = 14575186560.

The previous prime is 21255480529. The next prime is 21255480577. The reversal of 21255480575 is 57508455212.

It is not a de Polignac number, because 21255480575 - 2⁸ = 21255480319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255480577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60729770 + ... + 60730119.

It is an arithmetic number, because the mean of its divisors is an integer number (2510171060).

Almost surely, 2^21255480575 is an apocalyptic number.

21255480575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21255480575 is a deficient number, since it is larger than the sum of its proper divisors (8866572145).

21255480575 is a wasteful number, since it uses less digits than its factorization.

21255480575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121459906 (or 121459901 counting only the distinct ones).

The product of its (nonzero) digits is 560000, while the sum is 44.

The spelling of 21255480575 in words is "twenty-one billion, two hundred fifty-five million, four hundred eighty thousand, five hundred seventy-five".