215933921280 has 2304 divisors, whose sum is σ = 1030288896000. Its totient is φ = 42918543360.

The previous prime is 215933921267. The next prime is 215933921309. The reversal of 215933921280 is 82129339512.

215933921280 is a `hidden beast` number, since 2 + 1 + 593 + 39 + 2 + 1 + 28 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2304).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9388431349 + ... + 9388431371.

It is an arithmetic number, because the mean of its divisors is an integer number (447174000).

Almost surely, 2^215933921280 is an apocalyptic number.

215933921280 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 215933921280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (515144448000).

215933921280 is an abundant number, since it is smaller than the sum of its proper divisors (814354974720).

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

215933921280 is an equidigital number, since it uses as much as digits as its factorization.

215933921280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 215933921280 in words is "two hundred fifteen billion, nine hundred thirty-three million, nine hundred twenty-one thousand, two hundred eighty".