221723072 has 14 divisors (see below), whose sum is σ = 439981848. Its totient is φ = 110861504.

The previous prime is 221723041. The next prime is 221723081. The reversal of 221723072 is 270327122.

221723072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221723072² = 98322241314234368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1732148 + ... + 1732275.

Almost surely, 2^221723072 is an apocalyptic number.

It is an amenable number.

221723072 is a deficient number, since it is larger than the sum of its proper divisors (218258776).

221723072 is an equidigital number, since it uses as much as digits as its factorization.

221723072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464435 (or 3464425 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 221723072 is about 14890.3684306333. The cubic root of 221723072 is about 605.2530162262.

The spelling of 221723072 in words is "two hundred twenty-one million, seven hundred twenty-three thousand, seventy-two".