213221125 has 16 divisors (see below), whose sum is σ = 286571376. Its totient is φ = 157454400.

The previous prime is 213221117. The next prime is 213221143. The reversal of 213221125 is 521122312.

It can be written as a sum of positive squares in 8 ways, for example, as 39350529 + 173870596 = 6273^2 + 13186^2 .

It is not a de Polignac number, because 213221125 - 2³ = 213221117 is a prime.

It is a super-3 number, since 3×213221125³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63982 + ... + 67231.

It is an arithmetic number, because the mean of its divisors is an integer number (17910711).

Almost surely, 2^213221125 is an apocalyptic number.

213221125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213221125 is a deficient number, since it is larger than the sum of its proper divisors (73350251).

213221125 is a wasteful number, since it uses less digits than its factorization.

213221125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131241 (or 131231 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 213221125 is about 14602.0931718709. The cubic root of 213221125 is about 597.4158538855.

Adding to 213221125 its reverse (521122312), we get a palindrome (734343437).

The spelling of 213221125 in words is "two hundred thirteen million, two hundred twenty-one thousand, one hundred twenty-five".