216213720064 has 44 divisors (see below), whose sum is σ = 442267925704. Its totient is φ = 105592725504.

The previous prime is 216213720011. The next prime is 216213720067. The reversal of 216213720064 is 460027312612.

It is not an unprimeable number, because it can be changed into a prime (216213720067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2411157 + ... + 2499220.

It is an arithmetic number, because the mean of its divisors is an integer number (10051543766).

Almost surely, 2^216213720064 is an apocalyptic number.

It is an amenable number.

216213720064 is an abundant number, since it is smaller than the sum of its proper divisors (226054205640).

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

216213720064 is an equidigital number, since it uses as much as digits as its factorization.

216213720064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4910440 (or 4910422 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 216213720064 in words is "two hundred sixteen billion, two hundred thirteen million, seven hundred twenty thousand, sixty-four".