12121221020000 has 120 divisors (see below), whose sum is σ = 29840148920736. Its totient is φ = 4845215936000.

The previous prime is 12121221019991. The next prime is 12121221020113. The reversal of 12121221020000 is 2012212121.

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 19 ways as a sum of consecutive naturals, for example, 29536214 + ... + 29943786.

Almost surely, 2^{12121221020000} is an apocalyptic number.

12121221020000 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 12121221020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14920074460368).

12121221020000 is an abundant number, since it is smaller than the sum of its proper divisors (17718927900736).

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

12121221020000 is an equidigital number, since it uses as much as digits as its factorization.

12121221020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409090 (or 409067 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12121221020000 its reverse (2012212121), we get a palindrome (12123233232121).

The spelling of 12121221020000 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty thousand".