212432081 has 2 divisors, whose sum is σ = 212432082. Its totient is φ = 212432080.

The previous prime is 212432069. The next prime is 212432107. The reversal of 212432081 is 180234212.

It is a happy number.

212432081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153388225 + 59043856 = 12385^2 + 7684^2 .

It is a cyclic number.

It is not a de Polignac number, because 212432081 - 2¹⁰ = 212431057 is a prime.

It is a super-2 number, since 2×212432081² = 90254778075981122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212432021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106216040 + 106216041.

It is an arithmetic number, because the mean of its divisors is an integer number (106216041).

Almost surely, 2^212432081 is an apocalyptic number.

It is an amenable number.

212432081 is a deficient number, since it is larger than the sum of its proper divisors (1).

212432081 is an equidigital number, since it uses as much as digits as its factorization.

212432081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 212432081 is about 14575.0499484564. The cubic root of 212432081 is about 596.6780125734.

Adding to 212432081 its reverse (180234212), we get a palindrome (392666293).

The spelling of 212432081 in words is "two hundred twelve million, four hundred thirty-two thousand, eighty-one".