221413505 has 8 divisors (see below), whose sum is σ = 265798824. Its totient is φ = 177062400.

The previous prime is 221413487. The next prime is 221413519. The reversal of 221413505 is 505314122.

It can be written as a sum of positive squares in 4 ways, for example, as 2876416 + 218537089 = 1696^2 + 14783^2 .

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

It is not a de Polignac number, because 221413505 - 2²⁰ = 220364929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8945 + ... + 22865.

It is an arithmetic number, because the mean of its divisors is an integer number (33224853).

Almost surely, 2^221413505 is an apocalyptic number.

It is an amenable number.

221413505 is a deficient number, since it is larger than the sum of its proper divisors (44385319).

221413505 is a wasteful number, since it uses less digits than its factorization.

221413505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17107.

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

The square root of 221413505 is about 14879.9699260449. The cubic root of 221413505 is about 604.9712027820.

Adding to 221413505 its reverse (505314122), we get a palindrome (726727627).

The spelling of 221413505 in words is "two hundred twenty-one million, four hundred thirteen thousand, five hundred five".