221235113725 has 12 divisors (see below), whose sum is σ = 283791250260. Its totient is φ = 170885052800.

The previous prime is 221235113719. The next prime is 221235113753. The reversal of 221235113725 is 527311532122.

It can be written as a sum of positive squares in 6 ways, for example, as 210076036 + 221025037689 = 14494^2 + 470133^2 .

It is not a de Polignac number, because 221235113725 - 2²⁹ = 220698242813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152575216 + ... + 152576665.

It is an arithmetic number, because the mean of its divisors is an integer number (23649270855).

Almost surely, 2^221235113725 is an apocalyptic number.

221235113725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221235113725 is a deficient number, since it is larger than the sum of its proper divisors (62556136535).

221235113725 is a wasteful number, since it uses less digits than its factorization.

221235113725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305151920 (or 305151915 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

Adding to 221235113725 its reverse (527311532122), we get a palindrome (748546645847).

The spelling of 221235113725 in words is "two hundred twenty-one billion, two hundred thirty-five million, one hundred thirteen thousand, seven hundred twenty-five".