21013116600 has 96 divisors (see below), whose sum is σ = 74446485120. Its totient is φ = 4802997120.

The previous prime is 21013116571. The next prime is 21013116637. The reversal of 21013116600 is 661131012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2497362 + ... + 2505761.

It is an arithmetic number, because the mean of its divisors is an integer number (775484220).

Almost surely, 2^21013116600 is an apocalyptic number.

21013116600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013116600 is an abundant number, since it is smaller than the sum of its proper divisors (53433368520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21013116600 is a wasteful number, since it uses less digits than its factorization.

21013116600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5003149 (or 5003140 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21013116600 its reverse (661131012), we get a palindrome (21674247612).

The spelling of 21013116600 in words is "twenty-one billion, thirteen million, one hundred sixteen thousand, six hundred".