213115225 has 6 divisors (see below), whose sum is σ = 264262910. Its totient is φ = 170492160.

The previous prime is 213115211. The next prime is 213115237. The reversal of 213115225 is 522511312.

It can be written as a sum of positive squares in 3 ways, for example, as 8596624 + 204518601 = 2932^2 + 14301^2 .

It is not a de Polignac number, because 213115225 - 2¹³ = 213107033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213115196 and 213115205.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4262280 + ... + 4262329.

Almost surely, 2^213115225 is an apocalyptic number.

213115225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213115225 is a deficient number, since it is larger than the sum of its proper divisors (51147685).

213115225 is an equidigital number, since it uses as much as digits as its factorization.

213115225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8524619 (or 8524614 counting only the distinct ones).

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

The square root of 213115225 is about 14598.4665290571. The cubic root of 213115225 is about 597.3169318300.

Adding to 213115225 its reverse (522511312), we get a palindrome (735626537).

The spelling of 213115225 in words is "two hundred thirteen million, one hundred fifteen thousand, two hundred twenty-five".