21416455663500 has 96 divisors (see below), whose sum is σ = 64376484157440. Its totient is φ = 5526827256000.

The previous prime is 21416455663423. The next prime is 21416455663511. The reversal of 21416455663500 is 536655461412.

It is a happy number.

It is a super-2 number, since 2×21416455663500² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21416455663500.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230237970 + ... + 230330969.

It is an arithmetic number, because the mean of its divisors is an integer number (670588376640).

Almost surely, 2^{21416455663500} is an apocalyptic number.

21416455663500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21416455663500 is an abundant number, since it is smaller than the sum of its proper divisors (42960028493940).

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

21416455663500 is a wasteful number, since it uses less digits than its factorization.

21416455663500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460568992 (or 460568980 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 21416455663500 in words is "twenty-one trillion, four hundred sixteen billion, four hundred fifty-five million, six hundred sixty-three thousand, five hundred".