212410505 has 4 divisors (see below), whose sum is σ = 254892612. Its totient is φ = 169928400.

The previous prime is 212410501. The next prime is 212410511. The reversal of 212410505 is 505014212.

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 42994249 + 169416256 = 6557^2 + 13016^2 .

It is not a de Polignac number, because 212410505 - 2² = 212410501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212410501) 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, 21241046 + ... + 21241055.

It is an arithmetic number, because the mean of its divisors is an integer number (63723153).

Almost surely, 2^212410505 is an apocalyptic number.

It is an amenable number.

212410505 is a deficient number, since it is larger than the sum of its proper divisors (42482107).

212410505 is an equidigital number, since it uses as much as digits as its factorization.

212410505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42482106.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 212410505 is about 14574.3097606713. The cubic root of 212410505 is about 596.6578110411.

Adding to 212410505 its reverse (505014212), we get a palindrome (717424717).

The spelling of 212410505 in words is "two hundred twelve million, four hundred ten thousand, five hundred five".