21579010525 has 6 divisors (see below), whose sum is σ = 26757973082. Its totient is φ = 17263208400.

The previous prime is 21579010483. The next prime is 21579010529. The reversal of 21579010525 is 52501097512.

It can be written as a sum of positive squares in 3 ways, for example, as 5752615716 + 15826394809 = 75846^2 + 125803^2 .

It is not a de Polignac number, because 21579010525 - 2³³ = 12989075933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21579010529) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 431580186 + ... + 431580235.

Almost surely, 2^21579010525 is an apocalyptic number.

21579010525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21579010525 is a deficient number, since it is larger than the sum of its proper divisors (5178962557).

21579010525 is an equidigital number, since it uses as much as digits as its factorization.

21579010525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863160431 (or 863160426 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 37.

The spelling of 21579010525 in words is "twenty-one billion, five hundred seventy-nine million, ten thousand, five hundred twenty-five".