21192521559 has 16 divisors (see below), whose sum is σ = 30832116480. Its totient is φ = 12841189760.

The previous prime is 21192521531. The next prime is 21192521621. The reversal of 21192521559 is 95512529112.

It is a cyclic number.

It is not a de Polignac number, because 21192521559 - 2¹⁵ = 21192488791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21192521559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21192521509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92302 + ... + 225620.

It is an arithmetic number, because the mean of its divisors is an integer number (1927007280).

Almost surely, 2^21192521559 is an apocalyptic number.

21192521559 is a deficient number, since it is larger than the sum of its proper divisors (9639594921).

21192521559 is a wasteful number, since it uses less digits than its factorization.

21192521559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138150.

The product of its digits is 81000, while the sum is 42.

The spelling of 21192521559 in words is "twenty-one billion, one hundred ninety-two million, five hundred twenty-one thousand, five hundred fifty-nine".