216621515012 has 12 divisors (see below), whose sum is σ = 433243030080. Its totient is φ = 92837792136.

The previous prime is 216621514999. The next prime is 216621515029. The reversal of 216621515012 is 210515126612.

216621515012 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 216621515012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3868241312 + ... + 3868241367.

It is an arithmetic number, because the mean of its divisors is an integer number (36103585840).

Almost surely, 2^216621515012 is an apocalyptic number.

It is an amenable number.

216621515012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216621515012 is a wasteful number, since it uses less digits than its factorization.

216621515012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7736482690 (or 7736482688 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 216621515012 in words is "two hundred sixteen billion, six hundred twenty-one million, five hundred fifteen thousand, twelve".