221112125 has 16 divisors (see below), whose sum is σ = 297176880. Its totient is φ = 163281600.

The previous prime is 221112121. The next prime is 221112161. The reversal of 221112125 is 521211122.

It can be written as a sum of positive squares in 8 ways, for example, as 119727364 + 101384761 = 10942^2 + 10069^2 .

It is not a de Polignac number, because 221112125 - 2² = 221112121 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66410 + ... + 69659.

It is an arithmetic number, because the mean of its divisors is an integer number (18573555).

Almost surely, 2^221112125 is an apocalyptic number.

221112125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221112125 is a deficient number, since it is larger than the sum of its proper divisors (76064755).

221112125 is a wasteful number, since it uses less digits than its factorization.

221112125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136097 (or 136087 counting only the distinct ones).

The product of its digits is 80, while the sum is 17.

The square root of 221112125 is about 14869.8394409624. The cubic root of 221112125 is about 604.6965898898.

Adding to 221112125 its reverse (521211122), we get a palindrome (742323247).

The spelling of 221112125 in words is "two hundred twenty-one million, one hundred twelve thousand, one hundred twenty-five".