221037172 has 12 divisors (see below), whose sum is σ = 387060100. Its totient is φ = 110448576.

The previous prime is 221037169. The next prime is 221037197. The reversal of 221037172 is 271730122.

It can be written as a sum of positive squares in 2 ways, for example, as 157101156 + 63936016 = 12534^2 + 7996^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10047 + ... + 23302.

Almost surely, 2^221037172 is an apocalyptic number.

It is an amenable number.

221037172 is a deficient number, since it is larger than the sum of its proper divisors (166022928).

221037172 is a wasteful number, since it uses less digits than its factorization.

221037172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35010 (or 35008 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 221037172 is about 14867.3189244060. The cubic root of 221037172 is about 604.6282551090.

Adding to 221037172 its reverse (271730122), we get a palindrome (492767294).

The spelling of 221037172 in words is "two hundred twenty-one million, thirty-seven thousand, one hundred seventy-two".