27521340205 has 32 divisors (see below), whose sum is σ = 35447293440. Its totient is φ = 20438645760.

The previous prime is 27521340173. The next prime is 27521340211. The reversal of 27521340205 is 50204312572.

It is not a de Polignac number, because 27521340205 - 2⁵ = 27521340173 is a prime.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 10279327 + ... + 10282003.

It is an arithmetic number, because the mean of its divisors is an integer number (1107727920).

Almost surely, 2^27521340205 is an apocalyptic number.

It is an amenable number.

27521340205 is a deficient number, since it is larger than the sum of its proper divisors (7925953235).

27521340205 is a wasteful number, since it uses less digits than its factorization.

27521340205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4309.

The product of its (nonzero) digits is 16800, while the sum is 31.

Adding to 27521340205 its reverse (50204312572), we get a palindrome (77725652777).

The spelling of 27521340205 in words is "twenty-seven billion, five hundred twenty-one million, three hundred forty thousand, two hundred five".