121644351360 has 768 divisors, whose sum is σ = 513532431360. Its totient is φ = 25899761664.

The previous prime is 121644351341. The next prime is 121644351397. The reversal of 121644351360 is 63153446121.

121644351360 is a `hidden beast` number, since 1 + 2 + 1 + 644 + 3 + 5 + 1 + 3 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 70599459 + ... + 70601181.

It is an arithmetic number, because the mean of its divisors is an integer number (668662020).

Almost surely, 2^121644351360 is an apocalyptic number.

121644351360 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 121644351360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256766215680).

121644351360 is an abundant number, since it is smaller than the sum of its proper divisors (391888080000).

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

121644351360 is a wasteful number, since it uses less digits than its factorization.

121644351360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875 (or 1860 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 121644351360 its reverse (63153446121), we get a palindrome (184797797481).

The spelling of 121644351360 in words is "one hundred twenty-one billion, six hundred forty-four million, three hundred fifty-one thousand, three hundred sixty".