212125540 has 24 divisors (see below), whose sum is σ = 485960832. Its totient is φ = 77136480.

The previous prime is 212125531. The next prime is 212125567. The reversal of 212125540 is 45521212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481884 + ... + 482323.

It is an arithmetic number, because the mean of its divisors is an integer number (20248368).

Almost surely, 2^212125540 is an apocalyptic number.

212125540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212125540 is an abundant number, since it is smaller than the sum of its proper divisors (273835292).

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

212125540 is a wasteful number, since it uses less digits than its factorization.

212125540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964227 (or 964225 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 212125540 is about 14564.5302018294. The cubic root of 212125540 is about 596.3908708782.

Adding to 212125540 its reverse (45521212), we get a palindrome (257646752).

The spelling of 212125540 in words is "two hundred twelve million, one hundred twenty-five thousand, five hundred forty".