221522125 has 32 divisors (see below), whose sum is σ = 311380992. Its totient is φ = 155880000.

The previous prime is 221522113. The next prime is 221522137. The reversal of 221522125 is 521225122.

It is an interprime number because it is at equal distance from previous prime (221522113) and next prime (221522137).

It is not a de Polignac number, because 221522125 - 2¹¹ = 221520077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221522096 and 221522105.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 40027 + ... + 45223.

It is an arithmetic number, because the mean of its divisors is an integer number (9730656).

Almost surely, 2^221522125 is an apocalyptic number.

221522125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221522125 is a deficient number, since it is larger than the sum of its proper divisors (89858867).

221522125 is a wasteful number, since it uses less digits than its factorization.

221522125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5254 (or 5244 counting only the distinct ones).

The product of its digits is 800, while the sum is 22.

The square root of 221522125 is about 14883.6193514884. The cubic root of 221522125 is about 605.0701145887.

Adding to 221522125 its reverse (521225122), we get a palindrome (742747247).

The spelling of 221522125 in words is "two hundred twenty-one million, five hundred twenty-two thousand, one hundred twenty-five".