21216360000 has 280 divisors, whose sum is σ = 76527928224. Its totient is φ = 5143040000.

The previous prime is 21216359993. The next prime is 21216360047. The reversal of 21216360000 is 6361212.

It is a happy number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 1311964 + ... + 1328036.

Almost surely, 2^21216360000 is an apocalyptic number.

21216360000 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 21216360000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38263964112).

21216360000 is an abundant number, since it is smaller than the sum of its proper divisors (55311568224).

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

21216360000 is a wasteful number, since it uses less digits than its factorization.

21216360000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16119 (or 16094 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The spelling of 21216360000 in words is "twenty-one billion, two hundred sixteen million, three hundred sixty thousand".