221131425 has 24 divisors (see below), whose sum is σ = 375489856. Its totient is φ = 114747840.

The previous prime is 221131411. The next prime is 221131429. The reversal of 221131425 is 524131122.

It is not a de Polignac number, because 221131425 - 2⁷ = 221131297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221131429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37069 + ... + 42618.

Almost surely, 2^221131425 is an apocalyptic number.

221131425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221131425 is a deficient number, since it is larger than the sum of its proper divisors (154358431).

221131425 is a wasteful number, since it uses less digits than its factorization.

221131425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79737 (or 79732 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 221131425 is about 14870.4883914416. The cubic root of 221131425 is about 604.7141832332.

Adding to 221131425 its reverse (524131122), we get a palindrome (745262547).

The spelling of 221131425 in words is "two hundred twenty-one million, one hundred thirty-one thousand, four hundred twenty-five".