121212210210 has 128 divisors (see below), whose sum is σ = 358642819584. Its totient is φ = 25531545600.

The previous prime is 121212210191. The next prime is 121212210227. The reversal of 121212210210 is 12012212121.

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 121212210210.

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 63 ways as a sum of consecutive naturals, for example, 1603792 + ... + 1677668.

It is an arithmetic number, because the mean of its divisors is an integer number (2801897028).

Almost surely, 2^121212210210 is an apocalyptic number.

121212210210 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 121212210210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179321409792).

121212210210 is an abundant number, since it is smaller than the sum of its proper divisors (237430609374).

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

121212210210 is a wasteful number, since it uses less digits than its factorization.

121212210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74508.

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

Adding to 121212210210 its reverse (12012212121), we get a palindrome (133224422331).

The spelling of 121212210210 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, two hundred ten".