212121120210 has 32 divisors (see below), whose sum is σ = 516064538880. Its totient is φ = 55790759808.

The previous prime is 212121120199. The next prime is 212121120227. The reversal of 212121120210 is 12021121212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212121120210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48427290 + ... + 48431669.

It is an arithmetic number, because the mean of its divisors is an integer number (16127016840).

Almost surely, 2^212121120210 is an apocalyptic number.

212121120210 is an abundant number, since it is smaller than the sum of its proper divisors (303943418670).

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

212121120210 is a wasteful number, since it uses less digits than its factorization.

212121120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96859042.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212121120210 its reverse (12021121212), we get a palindrome (224142241422).

The spelling of 212121120210 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred twenty thousand, two hundred ten".