125121220 has 24 divisors (see below), whose sum is σ = 300291264. Its totient is φ = 42898656.

The previous prime is 125121169. The next prime is 125121247. The reversal of 125121220 is 22121521.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 125121194 and 125121203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446722 + ... + 447001.

It is an arithmetic number, because the mean of its divisors is an integer number (12512136).

Almost surely, 2^125121220 is an apocalyptic number.

125121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125121220 is an abundant number, since it is smaller than the sum of its proper divisors (175170044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

125121220 is a wasteful number, since it uses less digits than its factorization.

125121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893739 (or 893737 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 125121220 is about 11185.7596970434. The cubic root of 125121220 is about 500.1615744484.

Adding to 125121220 its reverse (22121521), we get a palindrome (147242741).

The spelling of 125121220 in words is "one hundred twenty-five million, one hundred twenty-one thousand, two hundred twenty".