221504153 has 8 divisors (see below), whose sum is σ = 239309448. Its totient is φ = 203808384.

The previous prime is 221504149. The next prime is 221504159. The reversal of 221504153 is 351405122.

It can be written as a sum of positive squares in 4 ways, for example, as 29626249 + 191877904 = 5443^2 + 13852^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221504153 - 2² = 221504149 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221504159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23150 + ... + 31287.

It is an arithmetic number, because the mean of its divisors is an integer number (29913681).

Almost surely, 2^221504153 is an apocalyptic number.

It is an amenable number.

221504153 is a deficient number, since it is larger than the sum of its proper divisors (17805295).

221504153 is a wasteful number, since it uses less digits than its factorization.

221504153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54763.

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

The square root of 221504153 is about 14883.0155882469. The cubic root of 221504153 is about 605.0537511153.

Adding to 221504153 its reverse (351405122), we get a palindrome (572909275).

The spelling of 221504153 in words is "two hundred twenty-one million, five hundred four thousand, one hundred fifty-three".