21616605300 has 72 divisors (see below), whose sum is σ = 63477596896. Its totient is φ = 5678386560.

The previous prime is 21616605299. The next prime is 21616605337. The reversal of 21616605300 is 350661612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 517627 + ... + 557826.

Almost surely, 2^21616605300 is an apocalyptic number.

21616605300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21616605300 is an abundant number, since it is smaller than the sum of its proper divisors (41860991596).

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

21616605300 is a wasteful number, since it uses less digits than its factorization.

21616605300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075537 (or 1075530 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The spelling of 21616605300 in words is "twenty-one billion, six hundred sixteen million, six hundred five thousand, three hundred".