221232078 has 48 divisors (see below), whose sum is σ = 504709920. Its totient is φ = 69898752.

The previous prime is 221232061. The next prime is 221232083. The reversal of 221232078 is 870232122.

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 (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44418 + ... + 49146.

It is an arithmetic number, because the mean of its divisors is an integer number (10514790).

Almost surely, 2^221232078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221232078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252354960).

221232078 is an abundant number, since it is smaller than the sum of its proper divisors (283477842).

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

221232078 is a wasteful number, since it uses less digits than its factorization.

221232078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4873 (or 4870 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 221232078 is about 14873.8723270035. The cubic root of 221232078 is about 604.8059191230.

It can be divided in two parts, 22 and 1232078, that added together give a square (1232100 = 1110²).

The spelling of 221232078 in words is "two hundred twenty-one million, two hundred thirty-two thousand, seventy-eight".