212245005 has 16 divisors (see below), whose sum is σ = 388105344. Its totient is φ = 97026240.

The previous prime is 212245001. The next prime is 212245009. The reversal of 212245005 is 500542212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (212245001) and next prime (212245009).

It is not a de Polignac number, because 212245005 - 2² = 212245001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212245001) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1010586 + ... + 1010795.

It is an arithmetic number, because the mean of its divisors is an integer number (24256584).

Almost surely, 2^212245005 is an apocalyptic number.

It is an amenable number.

212245005 is a deficient number, since it is larger than the sum of its proper divisors (175860339).

212245005 is a wasteful number, since it uses less digits than its factorization.

212245005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021396.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 212245005 is about 14568.6308553687. The cubic root of 212245005 is about 596.5028084670.

Adding to 212245005 its reverse (500542212), we get a palindrome (712787217).

The spelling of 212245005 in words is "two hundred twelve million, two hundred forty-five thousand, five".