212212245 has 32 divisors (see below), whose sum is σ = 389173248. Its totient is φ = 96729408.

The previous prime is 212212243. The next prime is 212212261. The reversal of 212212245 is 542212212.

It is not a de Polignac number, because 212212245 - 2¹ = 212212243 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 (212212243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35782 + ... + 41288.

It is an arithmetic number, because the mean of its divisors is an integer number (12161664).

Almost surely, 2^212212245 is an apocalyptic number.

It is an amenable number.

212212245 is a deficient number, since it is larger than the sum of its proper divisors (176961003).

212212245 is a wasteful number, since it uses less digits than its factorization.

212212245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5889.

The product of its digits is 640, while the sum is 21.

The square root of 212212245 is about 14567.5064784609. The cubic root of 212212245 is about 596.4721168338.

Adding to 212212245 its reverse (542212212), we get a palindrome (754424457).

The spelling of 212212245 in words is "two hundred twelve million, two hundred twelve thousand, two hundred forty-five".