210820212 has 48 divisors (see below), whose sum is σ = 564211200. Its totient is φ = 68005440.

The previous prime is 210820187. The next prime is 210820217. The reversal of 210820212 is 212028012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210820217) 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, 28137 + ... + 34832.

It is an arithmetic number, because the mean of its divisors is an integer number (11754400).

Almost surely, 2^210820212 is an apocalyptic number.

It is an amenable number.

210820212 is an abundant number, since it is smaller than the sum of its proper divisors (353390988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210820212 is a wasteful number, since it uses less digits than its factorization.

210820212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63013 (or 63005 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 210820212 is about 14519.6491693154. The cubic root of 210820212 is about 595.1650433099.

Adding to 210820212 its reverse (212028012), we get a palindrome (422848224).

The spelling of 210820212 in words is "two hundred ten million, eight hundred twenty thousand, two hundred twelve".