121221112320000 has 1560 divisors, whose sum is σ = 545524130648640. Its totient is φ = 25188433920000.

The previous prime is 121221112319999. The next prime is 121221112320019. The reversal of 121221112320000 is 23211122121.

121221112320000 is a `hidden beast` number, since 1 + 212 + 21 + 112 + 320 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1774045836 + ... + 1774114164.

It is an arithmetic number, because the mean of its divisors is an integer number (349694955544).

Almost surely, 2^{121221112320000} is an apocalyptic number.

121221112320000 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 121221112320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272762065324320).

121221112320000 is an abundant number, since it is smaller than the sum of its proper divisors (424303018328640).

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

121221112320000 is an equidigital number, since it uses as much as digits as its factorization.

121221112320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68397 (or 68357 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 121221112320000 its reverse (23211122121), we get a palindrome (121244323442121).

The spelling of 121221112320000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, three hundred twenty thousand".