216421065360 has 60 divisors (see below), whose sum is σ = 726814080252. Its totient is φ = 57712283904.

The previous prime is 216421065281. The next prime is 216421065407. The reversal of 216421065360 is 63560124612.

216421065360 is a `hidden beast` number, since 2 + 1 + 642 + 1 + 0 + 6 + 5 + 3 + 6 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 56779264656 + 159641800704 = 238284^2 + 399552^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 150291687 + ... + 150293126.

Almost surely, 2^216421065360 is an apocalyptic number.

216421065360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216421065360 is an abundant number, since it is smaller than the sum of its proper divisors (510393014892).

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

216421065360 is a wasteful number, since it uses less digits than its factorization.

216421065360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300584832 (or 300584823 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 216421065360 its reverse (63560124612), we get a palindrome (279981189972).

The spelling of 216421065360 in words is "two hundred sixteen billion, four hundred twenty-one million, sixty-five thousand, three hundred sixty".