221450242225 has 9 divisors (see below), whose sum is σ = 274601218017. Its totient is φ = 177158311440.

The previous prime is 221450242201. The next prime is 221450242249. The reversal of 221450242225 is 522242054122.

The square root of 221450242225 is 470585.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (221450242201) and next prime (221450242249).

It can be written as a sum of positive squares in 4 ways, for example, as 2074164849 + 219376077376 = 45543^2 + 468376^2 .

It is not a de Polignac number, because 221450242225 - 2⁹ = 221450241713 is a prime.

It is a super-2 number, since 2×221450242225² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2305867 + ... + 2399983.

Almost surely, 2^221450242225 is an apocalyptic number.

221450242225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221450242225 is the 470585-th square number.

221450242225 is the 235293-rd centered octagonal number.

It is an amenable number.

221450242225 is a deficient number, since it is larger than the sum of its proper divisors (53150975792).

221450242225 is an frugal number, since it uses more digits than its factorization.

221450242225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188244 (or 94122 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 221450242225 its reverse (522242054122), we get a palindrome (743692296347).

The spelling of 221450242225 in words is "two hundred twenty-one billion, four hundred fifty million, two hundred forty-two thousand, two hundred twenty-five".