121340425216 has 44 divisors (see below), whose sum is σ = 242732269252. Its totient is φ = 60627714048.

The previous prime is 121340425189. The next prime is 121340425231. The reversal of 121340425216 is 612524043121.

It can be written as a sum of positive squares in 2 ways, for example, as 103941760000 + 17398665216 = 322400^2 + 131904^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1447096 + ... + 1528648.

It is an arithmetic number, because the mean of its divisors is an integer number (5516642483).

Almost surely, 2^121340425216 is an apocalyptic number.

121340425216 is a gapful number since it is divisible by the number (16) 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 121340425216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121366134626).

121340425216 is an abundant number, since it is smaller than the sum of its proper divisors (121391844036).

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

121340425216 is an equidigital number, since it uses as much as digits as its factorization.

121340425216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83026 (or 83008 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 121340425216 its reverse (612524043121), we get a palindrome (733864468337).

The spelling of 121340425216 in words is "one hundred twenty-one billion, three hundred forty million, four hundred twenty-five thousand, two hundred sixteen".