125122221 has 12 divisors (see below), whose sum is σ = 206551072. Its totient is φ = 71498376.

The previous prime is 125122213. The next prime is 125122243. The reversal of 125122221 is 122221521.

It is not a de Polignac number, because 125122221 - 2³ = 125122213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125122194 and 125122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125122321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 992971 + ... + 993096.

Almost surely, 2^125122221 is an apocalyptic number.

It is an amenable number.

125122221 is a deficient number, since it is larger than the sum of its proper divisors (81428851).

125122221 is a wasteful number, since it uses less digits than its factorization.

125122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986080 (or 1986077 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 125122221 is about 11185.8044413444. The cubic root of 125122221 is about 500.1629082494.

Adding to 125122221 its reverse (122221521), we get a palindrome (247343742).

The spelling of 125122221 in words is "one hundred twenty-five million, one hundred twenty-two thousand, two hundred twenty-one".