221024425 has 6 divisors (see below), whose sum is σ = 274070318. Its totient is φ = 176819520.

The previous prime is 221024413. The next prime is 221024431. The reversal of 221024425 is 524420122.

It can be written as a sum of positive squares in 3 ways, for example, as 57517056 + 163507369 = 7584^2 + 12787^2 .

It is not a de Polignac number, because 221024425 - 2¹³ = 221016233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221024396 and 221024405.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4420464 + ... + 4420513.

Almost surely, 2^221024425 is an apocalyptic number.

221024425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221024425 is a deficient number, since it is larger than the sum of its proper divisors (53045893).

221024425 is an equidigital number, since it uses as much as digits as its factorization.

221024425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8840987 (or 8840982 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 221024425 is about 14866.8902262713. The cubic root of 221024425 is about 604.6166321099.

Adding to 221024425 its reverse (524420122), we get a palindrome (745444547).

The spelling of 221024425 in words is "two hundred twenty-one million, twenty-four thousand, four hundred twenty-five".