212205663 has 20 divisors (see below), whose sum is σ = 317683080. Its totient is φ = 141165072.

The previous prime is 212205629. The next prime is 212205677. The reversal of 212205663 is 366502212.

It is not a de Polignac number, because 212205663 - 2¹² = 212201567 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212200663) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 38656 + ... + 43802.

It is an arithmetic number, because the mean of its divisors is an integer number (15884154).

Almost surely, 2^212205663 is an apocalyptic number.

212205663 is a deficient number, since it is larger than the sum of its proper divisors (105477417).

212205663 is an equidigital number, since it uses as much as digits as its factorization.

212205663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5668 (or 5659 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 212205663 is about 14567.2805629603. The cubic root of 212205663 is about 596.4659500203.

Adding to 212205663 its reverse (366502212), we get a palindrome (578707875).

The spelling of 212205663 in words is "two hundred twelve million, two hundred five thousand, six hundred sixty-three".