216603121540 has 96 divisors (see below), whose sum is σ = 503803931904. Its totient is φ = 77705464320.

The previous prime is 216603121531. The next prime is 216603121583. The reversal of 216603121540 is 45121306612.

It is a happy number.

216603121540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6978255 + ... + 7009225.

It is an arithmetic number, because the mean of its divisors is an integer number (5247957624).

Almost surely, 2^216603121540 is an apocalyptic number.

216603121540 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 216603121540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251901965952).

216603121540 is an abundant number, since it is smaller than the sum of its proper divisors (287200810364).

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

216603121540 is a wasteful number, since it uses less digits than its factorization.

216603121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31757 (or 31755 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 216603121540 in words is "two hundred sixteen billion, six hundred three million, one hundred twenty-one thousand, five hundred forty".