221226558 has 128 divisors (see below), whose sum is σ = 559872000. Its totient is φ = 56888832.

The previous prime is 221226547. The next prime is 221226583. The reversal of 221226558 is 855622122.

It is a happy number.

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 63 ways as a sum of consecutive naturals, for example, 1484668 + ... + 1484816.

It is an arithmetic number, because the mean of its divisors is an integer number (4374000).

Almost surely, 2^221226558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221226558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279936000).

221226558 is an abundant number, since it is smaller than the sum of its proper divisors (338645442).

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

221226558 is a wasteful number, since it uses less digits than its factorization.

221226558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266.

The product of its digits is 19200, while the sum is 33.

The square root of 221226558 is about 14873.6867655602. The cubic root of 221226558 is about 604.8008888753.

It can be divided in two parts, 22122 and 6558, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 221226558 in words is "two hundred twenty-one million, two hundred twenty-six thousand, five hundred fifty-eight".