221211203250 has 128 divisors (see below), whose sum is σ = 568286005248. Its totient is φ = 57289848000.

The previous prime is 221211203243. The next prime is 221211203267. The reversal of 221211203250 is 52302112122.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3536749 + ... + 3598751.

It is an arithmetic number, because the mean of its divisors is an integer number (4439734416).

Almost surely, 2^221211203250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221211203250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284143002624).

221211203250 is an abundant number, since it is smaller than the sum of its proper divisors (347074801998).

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

221211203250 is a wasteful number, since it uses less digits than its factorization.

221211203250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62161 (or 62151 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 221211203250 its reverse (52302112122), we get a palindrome (273513315372).

The spelling of 221211203250 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred three thousand, two hundred fifty".