212512081 has 4 divisors (see below), whose sum is σ = 212930100. Its totient is φ = 212094064.

The previous prime is 212512073. The next prime is 212512103. The reversal of 212512081 is 180215212.

212512081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164070481 + 48441600 = 12809^2 + 6960^2 .

It is a cyclic number.

It is not a de Polignac number, because 212512081 - 2³ = 212512073 is a prime.

It is a super-2 number, since 2×212512081² = 90322769141901122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212512031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208246 + ... + 209263.

It is an arithmetic number, because the mean of its divisors is an integer number (53232525).

Almost surely, 2^212512081 is an apocalyptic number.

It is an amenable number.

212512081 is a deficient number, since it is larger than the sum of its proper divisors (418019).

212512081 is an equidigital number, since it uses as much as digits as its factorization.

212512081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418018.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 212512081 is about 14577.7941061054. The cubic root of 212512081 is about 596.7529043536.

Adding to 212512081 its reverse (180215212), we get a palindrome (392727293).

It can be divided in two parts, 21251 and 2081, that added together give a palindrome (23332).

The spelling of 212512081 in words is "two hundred twelve million, five hundred twelve thousand, eighty-one".