21255603513423 has 8 divisors (see below), whose sum is σ = 28346487641088. Its totient is φ = 14167560864024.

The previous prime is 21255603513409. The next prime is 21255603513491. The reversal of 21255603513423 is 32431530655212.

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

It is not a de Polignac number, because 21255603513423 - 2⁹ = 21255603512911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255603513493) 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 7 ways as a sum of consecutive naturals, for example, 710352111 + ... + 710382032.

It is an arithmetic number, because the mean of its divisors is an integer number (3543310955136).

Almost surely, 2^{21255603513423} is an apocalyptic number.

21255603513423 is a deficient number, since it is larger than the sum of its proper divisors (7090884127665).

21255603513423 is a wasteful number, since it uses less digits than its factorization.

21255603513423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420739133.

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 21255603513423 in words is "twenty-one trillion, two hundred fifty-five billion, six hundred three million, five hundred thirteen thousand, four hundred twenty-three".