212213005 has 8 divisors (see below), whose sum is σ = 254782872. Its totient is φ = 169685568.

The previous prime is 212212999. The next prime is 212213051. The reversal of 212213005 is 500312212.

It can be written as a sum of positive squares in 4 ways, for example, as 33028009 + 179184996 = 5747^2 + 13386^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212213005 - 2⁷ = 212212877 is a prime.

It is a super-2 number, since 2×212213005² = 90068718982260050, which contains 22 as substring.

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 212213005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1699 + ... + 20671.

It is an arithmetic number, because the mean of its divisors is an integer number (31847859).

Almost surely, 2^212213005 is an apocalyptic number.

It is an amenable number.

212213005 is a deficient number, since it is larger than the sum of its proper divisors (42569867).

212213005 is a wasteful number, since it uses less digits than its factorization.

212213005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21215.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 212213005 is about 14567.5325638902. The cubic root of 212213005 is about 596.4728288855.

Adding to 212213005 its reverse (500312212), we get a palindrome (712525217).

The spelling of 212213005 in words is "two hundred twelve million, two hundred thirteen thousand, five".