121202243440 has 80 divisors (see below), whose sum is σ = 285099609600. Its totient is φ = 47912933376.

The previous prime is 121202243413. The next prime is 121202243443. The reversal of 121202243440 is 44342202121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202243443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29140081 + ... + 29144239.

It is an arithmetic number, because the mean of its divisors is an integer number (3563745120).

Almost surely, 2^121202243440 is an apocalyptic number.

121202243440 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 121202243440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142549804800).

121202243440 is an abundant number, since it is smaller than the sum of its proper divisors (163897366160).

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

121202243440 is a wasteful number, since it uses less digits than its factorization.

121202243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8354 (or 8348 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 121202243440 its reverse (44342202121), we get a palindrome (165544445561).

The spelling of 121202243440 in words is "one hundred twenty-one billion, two hundred two million, two hundred forty-three thousand, four hundred forty".