121121000000000 has 1600 divisors, whose sum is σ = 409519645565184. Its totient is φ = 34848000000000.

The previous prime is 121120999999991. The next prime is 121121000000047. The reversal of 121121000000000 is 121121.

It is a tau number, because it is divible by the number of its divisors (1600).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 9316999999994 + ... + 9317000000006.

Almost surely, 2^{121121000000000} is an apocalyptic number.

121121000000000 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 121121000000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204759822782592).

121121000000000 is an abundant number, since it is smaller than the sum of its proper divisors (288398645565184).

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

121121000000000 is an frugal number, since it uses more digits than its factorization.

121121000000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 121121000000000 its reverse (121121), we get a palindrome (121121000121121).

121121000000000 divided by its reverse (121121) gives a 9-th power (1000000000 = 10⁹).

It can be divided in two parts, 121 and 121000000000, that added together give a palindrome (121000000121).

The spelling of 121121000000000 in words is "one hundred twenty-one trillion, one hundred twenty-one billion", and thus it is an aban number.