12212121222210 has 1024 divisors, whose sum is σ = 39922568921088. Its totient is φ = 2320754540544.

The previous prime is 12212121222143. The next prime is 12212121222281. The reversal of 12212121222210 is 1222212121221.

12212121222210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 10591604994 + ... + 10591606146.

It is an arithmetic number, because the mean of its divisors is an integer number (38986883712).

Almost surely, 2^{12212121222210} is an apocalyptic number.

12212121222210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12212121222210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19961284460544).

12212121222210 is an abundant number, since it is smaller than the sum of its proper divisors (27710447698878).

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

12212121222210 is a wasteful number, since it uses less digits than its factorization.

12212121222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12212121222210 its reverse (1222212121221), we get a palindrome (13434333343431).

The spelling of 12212121222210 in words is "twelve trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred ten".