21265478592 has 56 divisors (see below), whose sum is σ = 56575860432. Its totient is φ = 7049318400.

The previous prime is 21265478573. The next prime is 21265478603. The reversal of 21265478592 is 29587456212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271209 + ... + 340712.

It is an arithmetic number, because the mean of its divisors is an integer number (1010283222).

Almost surely, 2^21265478592 is an apocalyptic number.

It is an amenable number.

21265478592 is an abundant number, since it is smaller than the sum of its proper divisors (35310381840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21265478592 is a wasteful number, since it uses less digits than its factorization.

21265478592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612117 (or 612107 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 51.

The spelling of 21265478592 in words is "twenty-one billion, two hundred sixty-five million, four hundred seventy-eight thousand, five hundred ninety-two".