125821212 has 24 divisors (see below), whose sum is σ = 320272512. Its totient is φ = 38127600.

The previous prime is 125821183. The next prime is 125821229. The reversal of 125821212 is 212128521.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 476464 + ... + 476727.

It is an arithmetic number, because the mean of its divisors is an integer number (13344688).

Almost surely, 2^125821212 is an apocalyptic number.

125821212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

125821212 is an abundant number, since it is smaller than the sum of its proper divisors (194451300).

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

125821212 is a wasteful number, since it uses less digits than its factorization.

125821212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953209 (or 953207 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

The square root of 125821212 is about 11217.0054827481. The cubic root of 125821212 is about 501.0925602188.

Adding to 125821212 its reverse (212128521), we get a palindrome (337949733).

The spelling of 125821212 in words is "one hundred twenty-five million, eight hundred twenty-one thousand, two hundred twelve".