12121212101020 has 72 divisors (see below), whose sum is σ = 28006588707552. Its totient is φ = 4403361452160.

The previous prime is 12121212101003. The next prime is 12121212101057. The reversal of 12121212101020 is 2010121212121.

It is a junction number, because it is equal to n+sod(n) for n = 12121212100985 and 12121212101003.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 20784 + ... + 4923703.

It is an arithmetic number, because the mean of its divisors is an integer number (388980398716).

Almost surely, 2^{12121212101020} is an apocalyptic number.

12121212101020 is a gapful number since it is divisible by the number (10) 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 12121212101020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14003294353776).

12121212101020 is an abundant number, since it is smaller than the sum of its proper divisors (15885376606532).

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

12121212101020 is a wasteful number, since it uses less digits than its factorization.

12121212101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4945531 (or 4945518 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12121212101020 its reverse (2010121212121), we get a palindrome (14131333313141).

The spelling of 12121212101020 in words is "twelve trillion, one hundred twenty-one billion, two hundred twelve million, one hundred one thousand, twenty".