221733072 has 160 divisors (see below), whose sum is σ = 718704000. Its totient is φ = 64834560.

The previous prime is 221733053. The next prime is 221733073. The reversal of 221733072 is 270337122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221733073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137004 + ... + 138612.

It is an arithmetic number, because the mean of its divisors is an integer number (4491900).

Almost surely, 2^221733072 is an apocalyptic number.

221733072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221733072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359352000).

221733072 is an abundant number, since it is smaller than the sum of its proper divisors (496970928).

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

221733072 is a wasteful number, since it uses less digits than its factorization.

221733072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 221733072 is about 14890.7042143748. The cubic root of 221733072 is about 605.2621153231.

The spelling of 221733072 in words is "two hundred twenty-one million, seven hundred thirty-three thousand, seventy-two".