21000553113 has 16 divisors (see below), whose sum is σ = 28601185536. Its totient is φ = 13700242560.

The previous prime is 21000553109. The next prime is 21000553157. The reversal of 21000553113 is 31135500012.

It is not a de Polignac number, because 21000553113 - 2² = 21000553109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000553113.

It is not an unprimeable number, because it can be changed into a prime (21000553183) 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, 1677445 + ... + 1689917.

It is an arithmetic number, because the mean of its divisors is an integer number (1787574096).

Almost surely, 2^21000553113 is an apocalyptic number.

It is an amenable number.

21000553113 is a deficient number, since it is larger than the sum of its proper divisors (7600632423).

21000553113 is a wasteful number, since it uses less digits than its factorization.

21000553113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24464.

The product of its (nonzero) digits is 450, while the sum is 21.

The spelling of 21000553113 in words is "twenty-one billion, five hundred fifty-three thousand, one hundred thirteen".