221232858 has 64 divisors (see below), whose sum is σ = 553512960. Its totient is φ = 57268800.

The previous prime is 221232853. The next prime is 221232859. The reversal of 221232858 is 858232122.

221232858 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221232853) by changing a digit.

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, 179103 + ... + 180333.

It is an arithmetic number, because the mean of its divisors is an integer number (8648640).

Almost surely, 2^221232858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221232858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276756480).

221232858 is an abundant number, since it is smaller than the sum of its proper divisors (332280102).

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

221232858 is a wasteful number, since it uses less digits than its factorization.

221232858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its digits is 15360, while the sum is 33.

The square root of 221232858 is about 14873.8985474555. The cubic root of 221232858 is about 604.8066299121.

The spelling of 221232858 in words is "two hundred twenty-one million, two hundred thirty-two thousand, eight hundred fifty-eight".