221723968 has 14 divisors (see below), whose sum is σ = 439983626. Its totient is φ = 110861952.

The previous prime is 221723917. The next prime is 221723969. The reversal of 221723968 is 869327122.

221723968 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 162001984 + 59721984 = 12728^2 + 7728^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221723968.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221723969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1732155 + ... + 1732282.

Almost surely, 2^221723968 is an apocalyptic number.

It is an amenable number.

221723968 is a deficient number, since it is larger than the sum of its proper divisors (218259658).

221723968 is an equidigital number, since it uses as much as digits as its factorization.

221723968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464449 (or 3464439 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 221723968 is about 14890.3985171653. The cubic root of 221723968 is about 605.2538315164.

The spelling of 221723968 in words is "two hundred twenty-one million, seven hundred twenty-three thousand, nine hundred sixty-eight".