121530353440 has 96 divisors (see below), whose sum is σ = 304111447920. Its totient is φ = 45736525824.

The previous prime is 121530353363. The next prime is 121530353471. The reversal of 121530353440 is 44353035121.

It can be written as a sum of positive squares in 8 ways, for example, as 43696049296 + 77834304144 = 209036^2 + 278988^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10147776 + ... + 10159744.

Almost surely, 2^121530353440 is an apocalyptic number.

121530353440 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 121530353440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152055723960).

121530353440 is an abundant number, since it is smaller than the sum of its proper divisors (182581094480).

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

121530353440 is a wasteful number, since it uses less digits than its factorization.

121530353440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15734 (or 15726 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 121530353440 its reverse (44353035121), we get a palindrome (165883388561).

The spelling of 121530353440 in words is "one hundred twenty-one billion, five hundred thirty million, three hundred fifty-three thousand, four hundred forty".