125621220 has 48 divisors (see below), whose sum is σ = 352598400. Its totient is φ = 33417216.

The previous prime is 125621219. The next prime is 125621227. The reversal of 125621220 is 22126521.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (125621227) 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 15 ways as a sum of consecutive naturals, for example, 24609 + ... + 29271.

It is an arithmetic number, because the mean of its divisors is an integer number (7345800).

Almost surely, 2^125621220 is an apocalyptic number.

125621220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125621220 is an abundant number, since it is smaller than the sum of its proper divisors (226977180).

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

125621220 is a wasteful number, since it uses less digits than its factorization.

125621220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124 (or 5122 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 125621220 is about 11208.0872587610. The cubic root of 125621220 is about 500.8269249696.

Adding to 125621220 its reverse (22126521), we get a palindrome (147747741).

The spelling of 125621220 in words is "one hundred twenty-five million, six hundred twenty-one thousand, two hundred twenty".