221231552 has 14 divisors (see below), whose sum is σ = 439006488. Its totient is φ = 110615744.

The previous prime is 221231551. The next prime is 221231579. The reversal of 221231552 is 255132122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221231551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1728308 + ... + 1728435.

Almost surely, 2^221231552 is an apocalyptic number.

It is an amenable number.

221231552 is a deficient number, since it is larger than the sum of its proper divisors (217774936).

221231552 is an equidigital number, since it uses as much as digits as its factorization.

221231552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456755 (or 3456745 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 221231552 is about 14873.8546449802. The cubic root of 221231552 is about 604.8054397950.

Adding to 221231552 its reverse (255132122), we get a palindrome (476363674).

The spelling of 221231552 in words is "two hundred twenty-one million, two hundred thirty-one thousand, five hundred fifty-two".