21160568455 has 16 divisors (see below), whose sum is σ = 27353973024. Its totient is φ = 15621690240.

The previous prime is 21160568453. The next prime is 21160568459. The reversal of 21160568455 is 55486506112.

It is not a de Polignac number, because 21160568455 - 2¹ = 21160568453 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 (21160568453) 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 15 ways as a sum of consecutive naturals, for example, 184665 + ... + 276445.

It is an arithmetic number, because the mean of its divisors is an integer number (1709623314).

Almost surely, 2^21160568455 is an apocalyptic number.

21160568455 is a deficient number, since it is larger than the sum of its proper divisors (6193404569).

21160568455 is a wasteful number, since it uses less digits than its factorization.

21160568455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95346.

The product of its (nonzero) digits is 288000, while the sum is 43.

The spelling of 21160568455 in words is "twenty-one billion, one hundred sixty million, five hundred sixty-eight thousand, four hundred fifty-five".