221400352 has 12 divisors (see below), whose sum is σ = 435882006. Its totient is φ = 110700160.

The previous prime is 221400329. The next prime is 221400353. The reversal of 221400352 is 253004122.

221400352 is digitally balanced in base 3, because in such base 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., 221295376 + 104976 = 14876^2 + 324^2 .

It is not an unprimeable number, because it can be changed into a prime (221400353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459349 + ... + 3459412.

Almost surely, 2^221400352 is an apocalyptic number.

It is an amenable number.

221400352 is a deficient number, since it is larger than the sum of its proper divisors (214481654).

221400352 is an equidigital number, since it uses as much as digits as its factorization.

221400352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6918771 (or 6918763 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 221400352 is about 14879.5279495016. The cubic root of 221400352 is about 604.9592231698.

Adding to 221400352 its reverse (253004122), we get a palindrome (474404474).

The spelling of 221400352 in words is "two hundred twenty-one million, four hundred thousand, three hundred fifty-two".