21559051524 has 24 divisors (see below), whose sum is σ = 50308489728. Its totient is φ = 7185773920.

The previous prime is 21559051487. The next prime is 21559051561. The reversal of 21559051524 is 42515095512.

It is an interprime number because it is at equal distance from previous prime (21559051487) and next prime (21559051561).

It is a super-2 number, since 2×21559051524² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100189 + ... + 230555.

It is an arithmetic number, because the mean of its divisors is an integer number (2096187072).

Almost surely, 2^21559051524 is an apocalyptic number.

It is an amenable number.

21559051524 is an abundant number, since it is smaller than the sum of its proper divisors (28749438204).

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

21559051524 is a wasteful number, since it uses less digits than its factorization.

21559051524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144155 (or 144153 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 21559051524 in words is "twenty-one billion, five hundred fifty-nine million, fifty-one thousand, five hundred twenty-four".