21355216300 has 36 divisors (see below), whose sum is σ = 50553623736. Its totient is φ = 7765532800.

The previous prime is 21355216297. The next prime is 21355216331. The reversal of 21355216300 is 361255312.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9705817 + ... + 9708016.

It is an arithmetic number, because the mean of its divisors is an integer number (1404267326).

Almost surely, 2^21355216300 is an apocalyptic number.

21355216300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21355216300 is an abundant number, since it is smaller than the sum of its proper divisors (29198407436).

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

21355216300 is a wasteful number, since it uses less digits than its factorization.

21355216300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19413858 (or 19413851 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 21355216300 in words is "twenty-one billion, three hundred fifty-five million, two hundred sixteen thousand, three hundred".