125224221 has 16 divisors (see below), whose sum is σ = 173009408. Its totient is φ = 80481600.

The previous prime is 125224217. The next prime is 125224223. The reversal of 125224221 is 122422521.

It is not a de Polignac number, because 125224221 - 2² = 125224217 is a prime.

It is a super-2 number, since 2×125224221² = 31362211050113682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125224223) 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, 23331 + ... + 28191.

It is an arithmetic number, because the mean of its divisors is an integer number (10813088).

Almost surely, 2^125224221 is an apocalyptic number.

It is an amenable number.

125224221 is a deficient number, since it is larger than the sum of its proper divisors (47785187).

125224221 is a wasteful number, since it uses less digits than its factorization.

125224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172.

The product of its digits is 640, while the sum is 21.

The square root of 125224221 is about 11190.3628627494. The cubic root of 125224221 is about 500.2987827555.

Adding to 125224221 its reverse (122422521), we get a palindrome (247646742).

The spelling of 125224221 in words is "one hundred twenty-five million, two hundred twenty-four thousand, two hundred twenty-one".