212120122221000 has 1280 divisors, whose sum is σ = 908835909696000. Its totient is φ = 45066000844800.

The previous prime is 212120122220989. The next prime is 212120122221037. The reversal of 212120122221000 is 122221021212.

It is a happy number.

212120122221000 is a `hidden beast` number, since 21 + 212 + 0 + 1 + 222 + 210 + 0 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 570783246 + ... + 571154754.

It is an arithmetic number, because the mean of its divisors is an integer number (710028054450).

Almost surely, 2^{212120122221000} is an apocalyptic number.

212120122221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212120122221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (454417954848000).

212120122221000 is an abundant number, since it is smaller than the sum of its proper divisors (696715787475000).

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

212120122221000 is a wasteful number, since it uses less digits than its factorization.

212120122221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371621 (or 371598 counting only the distinct ones).

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

Adding to 212120122221000 its reverse (122221021212), we get a palindrome (212242343242212).

The spelling of 212120122221000 in words is "two hundred twelve trillion, one hundred twenty billion, one hundred twenty-two million, two hundred twenty-one thousand".