215321125 has 16 divisors (see below), whose sum is σ = 269910576. Its totient is φ = 171494400.

The previous prime is 215321123. The next prime is 215321179. The reversal of 215321125 is 521123512.

It can be written as a sum of positive squares in 8 ways, for example, as 142491969 + 72829156 = 11937^2 + 8534^2 .

It is not a de Polignac number, because 215321125 - 2¹ = 215321123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215321096 and 215321105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215321123) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 25429 + ... + 32821.

It is an arithmetic number, because the mean of its divisors is an integer number (16869411).

Almost surely, 2^215321125 is an apocalyptic number.

215321125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215321125 is a deficient number, since it is larger than the sum of its proper divisors (54589451).

215321125 is an equidigital number, since it uses as much as digits as its factorization.

215321125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7641 (or 7631 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The square root of 215321125 is about 14673.8244844349. The cubic root of 215321125 is about 599.3707523467.

Adding to 215321125 its reverse (521123512), we get a palindrome (736444637).

The spelling of 215321125 in words is "two hundred fifteen million, three hundred twenty-one thousand, one hundred twenty-five".