121121020000 has 120 divisors (see below), whose sum is σ = 299065280976. Its totient is φ = 48271296000.

The previous prime is 121121019967. The next prime is 121121020021. The reversal of 121121020000 is 20121121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5529069 + ... + 5550931.

Almost surely, 2^121121020000 is an apocalyptic number.

121121020000 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 121121020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149532640488).

121121020000 is an abundant number, since it is smaller than the sum of its proper divisors (177944260976).

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

121121020000 is an equidigital number, since it uses as much as digits as its factorization.

121121020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22170 (or 22147 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121121020000 its reverse (20121121), we get a palindrome (121141141121).

It can be divided in two parts, 121 and 121020000, that added together give a palindrome (121020121).

The spelling of 121121020000 in words is "one hundred twenty-one billion, one hundred twenty-one million, twenty thousand".