212121220202010 has 384 divisors, whose sum is σ = 652248686089728. Its totient is φ = 46821058560000.

The previous prime is 212121220202009. The next prime is 212121220202077. The reversal of 212121220202010 is 10202022121212.

It is a happy number.

212121220202010 is a `hidden beast` number, since 21 + 212 + 1 + 220 + 202 + 0 + 10 = 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 polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 11898864717 + ... + 11898882543.

It is an arithmetic number, because the mean of its divisors is an integer number (1698564286692).

Almost surely, 2^{212121220202010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212121220202010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326124343044864).

212121220202010 is an abundant number, since it is smaller than the sum of its proper divisors (440127465887718).

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

212121220202010 is a wasteful number, since it uses less digits than its factorization.

212121220202010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22550 (or 22547 counting only the distinct ones).

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

Adding to 212121220202010 its reverse (10202022121212), we get a palindrome (222323242323222).

The spelling of 212121220202010 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twenty million, two hundred two thousand, ten".