21036616600 has 48 divisors (see below), whose sum is σ = 49021750800. Its totient is φ = 8395443840.

The previous prime is 21036616597. The next prime is 21036616607. The reversal of 21036616600 is 661663012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036616607) 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 11 ways as a sum of consecutive naturals, for example, 31999 + ... + 207598.

It is an arithmetic number, because the mean of its divisors is an integer number (1021286475).

Almost surely, 2^21036616600 is an apocalyptic number.

21036616600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21036616600 is an abundant number, since it is smaller than the sum of its proper divisors (27985134200).

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

21036616600 is a wasteful number, since it uses less digits than its factorization.

21036616600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240052 (or 240043 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 21036616600 in words is "twenty-one billion, thirty-six million, six hundred sixteen thousand, six hundred".