211212225 has 48 divisors (see below), whose sum is σ = 443443840. Its totient is φ = 96552000.

The previous prime is 211212203. The next prime is 211212241. The reversal of 211212225 is 522212112.

It is not a de Polignac number, because 211212225 - 2⁹ = 211211713 is a prime.

It is a super-2 number, since 2×211212225² = 89221207978901250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211212198 and 211212207.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17626 + ... + 27075.

Almost surely, 2^211212225 is an apocalyptic number.

211212225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211212225 is an abundant number, since it is smaller than the sum of its proper divisors (232231615).

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

211212225 is a wasteful number, since it uses less digits than its factorization.

211212225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44727 (or 44716 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 211212225 is about 14533.1422961450. The cubic root of 211212225 is about 595.5337112678.

Adding to 211212225 its reverse (522212112), we get a palindrome (733424337).

The spelling of 211212225 in words is "two hundred eleven million, two hundred twelve thousand, two hundred twenty-five".