21545067586 has 16 divisors (see below), whose sum is σ = 36936426240. Its totient is φ = 9233094240.

The previous prime is 21545067559. The next prime is 21545067641. The reversal of 21545067586 is 68576054512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344695 + ... + 402373.

It is an arithmetic number, because the mean of its divisors is an integer number (2308526640).

Almost surely, 2^21545067586 is an apocalyptic number.

21545067586 is a deficient number, since it is larger than the sum of its proper divisors (15391358654).

21545067586 is a wasteful number, since it uses less digits than its factorization.

21545067586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84369.

The product of its (nonzero) digits is 2016000, while the sum is 49.

The spelling of 21545067586 in words is "twenty-one billion, five hundred forty-five million, sixty-seven thousand, five hundred eighty-six".