21136016056 has 16 divisors (see below), whose sum is σ = 39678195600. Its totient is φ = 10555163904.

The previous prime is 21136016047. The next prime is 21136016063. The reversal of 21136016056 is 65061063112.

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 3 ways as a sum of consecutive naturals, for example, 1598521 + ... + 1611688.

It is an arithmetic number, because the mean of its divisors is an integer number (2479887225).

Almost surely, 2^21136016056 is an apocalyptic number.

It is an amenable number.

21136016056 is a deficient number, since it is larger than the sum of its proper divisors (18542179544).

21136016056 is a wasteful number, since it uses less digits than its factorization.

21136016056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211038 (or 3211034 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 21136016056 its reverse (65061063112), we get a palindrome (86197079168).

The spelling of 21136016056 in words is "twenty-one billion, one hundred thirty-six million, sixteen thousand, fifty-six".