212622505 has 4 divisors (see below), whose sum is σ = 255147012. Its totient is φ = 170098000.

The previous prime is 212622479. The next prime is 212622517. The reversal of 212622505 is 505226212.

It is a happy number.

212622505 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 143616256 + 69006249 = 11984^2 + 8307^2 .

It is not a de Polignac number, because 212622505 - 2¹⁹ = 212098217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212622505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21262246 + ... + 21262255.

It is an arithmetic number, because the mean of its divisors is an integer number (63786753).

Almost surely, 2^212622505 is an apocalyptic number.

It is an amenable number.

212622505 is a deficient number, since it is larger than the sum of its proper divisors (42524507).

212622505 is an equidigital number, since it uses as much as digits as its factorization.

212622505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42524506.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 212622505 is about 14581.5810185316. The cubic root of 212622505 is about 596.8562466080.

Adding to 212622505 its reverse (505226212), we get a palindrome (717848717).

The spelling of 212622505 in words is "two hundred twelve million, six hundred twenty-two thousand, five hundred five".