21613634700 has 144 divisors (see below), whose sum is σ = 72032722944. Its totient is φ = 4901299200.

The previous prime is 21613634689. The next prime is 21613634717. The reversal of 21613634700 is 743631612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 226180 + ... + 307220.

Almost surely, 2^21613634700 is an apocalyptic number.

21613634700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21613634700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36016361472).

21613634700 is an abundant number, since it is smaller than the sum of its proper divisors (50419088244).

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

21613634700 is a wasteful number, since it uses less digits than its factorization.

21613634700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81192 (or 81185 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The spelling of 21613634700 in words is "twenty-one billion, six hundred thirteen million, six hundred thirty-four thousand, seven hundred".