21559254524 has 24 divisors (see below), whose sum is σ = 38215719360. Its totient is φ = 10640545344.

The previous prime is 21559254517. The next prime is 21559254529. The reversal of 21559254524 is 42545295512.

It is a happy number.

It is a super-2 number, since 2×21559254524² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21559254529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2122562 + ... + 2132694.

It is an arithmetic number, because the mean of its divisors is an integer number (1592321640).

Almost surely, 2^21559254524 is an apocalyptic number.

It is an amenable number.

21559254524 is a deficient number, since it is larger than the sum of its proper divisors (16656464836).

21559254524 is a wasteful number, since it uses less digits than its factorization.

21559254524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16949 (or 16947 counting only the distinct ones).

The product of its digits is 720000, while the sum is 44.

The spelling of 21559254524 in words is "twenty-one billion, five hundred fifty-nine million, two hundred fifty-four thousand, five hundred twenty-four".