21240936586 has 16 divisors (see below), whose sum is σ = 35202371904. Its totient is φ = 9561137344.

The previous prime is 21240936571. The next prime is 21240936599. The reversal of 21240936586 is 68563904212.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13580380 + ... + 13581943.

It is an arithmetic number, because the mean of its divisors is an integer number (2200148244).

Almost surely, 2^21240936586 is an apocalyptic number.

21240936586 is a deficient number, since it is larger than the sum of its proper divisors (13961435318).

21240936586 is a wasteful number, since it uses less digits than its factorization.

21240936586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27162365.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 21240936586 in words is "twenty-one billion, two hundred forty million, nine hundred thirty-six thousand, five hundred eighty-six".