21060525985 has 16 divisors (see below), whose sum is σ = 25987477392. Its totient is φ = 16372972800.

The previous prime is 21060525977. The next prime is 21060526009. The reversal of 21060525985 is 58952506012.

It can be written as a sum of positive squares in 8 ways, for example, as 1801747809 + 19258778176 = 42447^2 + 138776^2 .

It is not a de Polignac number, because 21060525985 - 2³ = 21060525977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82555 + ... + 221215.

It is an arithmetic number, because the mean of its divisors is an integer number (1624217337).

Almost surely, 2^21060525985 is an apocalyptic number.

It is an amenable number.

21060525985 is a deficient number, since it is larger than the sum of its proper divisors (4926951407).

21060525985 is a wasteful number, since it uses less digits than its factorization.

21060525985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139524.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 21060525985 in words is "twenty-one billion, sixty million, five hundred twenty-five thousand, nine hundred eighty-five".