221250260550 has 144 divisors (see below), whose sum is σ = 604379817216. Its totient is φ = 53524152000.

The previous prime is 221250260521. The next prime is 221250260593. The reversal of 221250260550 is 55062052122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 8826535 + ... + 8851565.

It is an arithmetic number, because the mean of its divisors is an integer number (4197082064).

Almost surely, 2^221250260550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221250260550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302189908608).

221250260550 is an abundant number, since it is smaller than the sum of its proper divisors (383129556666).

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

221250260550 is a wasteful number, since it uses less digits than its factorization.

221250260550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25555 (or 25539 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 221250260550 in words is "two hundred twenty-one billion, two hundred fifty million, two hundred sixty thousand, five hundred fifty".