212161225 has 12 divisors (see below), whose sum is σ = 264038284. Its totient is φ = 169110720.

The previous prime is 212161211. The next prime is 212161267. The reversal of 212161225 is 522161212.

It can be written as a sum of positive squares in 6 ways, for example, as 284089 + 211877136 = 533^2 + 14556^2 .

It is not a de Polignac number, because 212161225 - 2⁵ = 212161193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212161196 and 212161205.

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 11 ways as a sum of consecutive naturals, for example, 8394 + ... + 22243.

Almost surely, 2^212161225 is an apocalyptic number.

212161225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

212161225 is a deficient number, since it is larger than the sum of its proper divisors (51877059).

212161225 is a wasteful number, since it uses less digits than its factorization.

212161225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30924 (or 30919 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 212161225 is about 14565.7552155733. The cubic root of 212161225 is about 596.4243117908.

The spelling of 212161225 in words is "two hundred twelve million, one hundred sixty-one thousand, two hundred twenty-five".