212100120021210 has 32 divisors (see below), whose sum is σ = 509834422711872. Its totient is φ = 56471794821120.

The previous prime is 212100120021199. The next prime is 212100120021259. The reversal of 212100120021210 is 12120021001212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 212100120021210.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5514804484 + ... + 5514842943.

It is an arithmetic number, because the mean of its divisors is an integer number (15932325709746).

Almost surely, 2^{212100120021210} is an apocalyptic number.

212100120021210 is an abundant number, since it is smaller than the sum of its proper divisors (297734302690662).

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

212100120021210 is a wasteful number, since it uses less digits than its factorization.

212100120021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11029648078.

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

Adding to 212100120021210 its reverse (12120021001212), we get a palindrome (224220141022422).

The spelling of 212100120021210 in words is "two hundred twelve trillion, one hundred billion, one hundred twenty million, twenty-one thousand, two hundred ten".