221430025 has 12 divisors (see below), whose sum is σ = 279755532. Its totient is φ = 173800640.

The previous prime is 221430023. The next prime is 221430029. The reversal of 221430025 is 520034122.

It can be written as a sum of positive squares in 6 ways, for example, as 2005056 + 219424969 = 1416^2 + 14813^2 .

It is not a de Polignac number, because 221430025 - 2¹ = 221430023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221429984 and 221430011.

It is not an unprimeable number, because it can be changed into a prime (221430023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82234 + ... + 84883.

It is an arithmetic number, because the mean of its divisors is an integer number (23312961).

Almost surely, 2^221430025 is an apocalyptic number.

221430025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221430025 is a deficient number, since it is larger than the sum of its proper divisors (58325507).

221430025 is a wasteful number, since it uses less digits than its factorization.

221430025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167180 (or 167175 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 221430025 is about 14880.5250243397. The cubic root of 221430025 is about 604.9862483499.

Adding to 221430025 its reverse (520034122), we get a palindrome (741464147).

The spelling of 221430025 in words is "two hundred twenty-one million, four hundred thirty thousand, twenty-five".