221136218850 has 96 divisors (see below), whose sum is σ = 554727888000. Its totient is φ = 58293665280.

The previous prime is 221136218839. The next prime is 221136218881. The reversal of 221136218850 is 58812631122.

221136218850 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221136218799 and 221136218808.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7162246 + ... + 7193054.

It is an arithmetic number, because the mean of its divisors is an integer number (5778415500).

Almost surely, 2^221136218850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221136218850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277363944000).

221136218850 is an abundant number, since it is smaller than the sum of its proper divisors (333591669150).

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

221136218850 is a wasteful number, since it uses less digits than its factorization.

221136218850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31372 (or 31367 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

Adding to 221136218850 its reverse (58812631122), we get a palindrome (279948849972).

The spelling of 221136218850 in words is "two hundred twenty-one billion, one hundred thirty-six million, two hundred eighteen thousand, eight hundred fifty".