121221021220000 has 720 divisors, whose sum is σ = 329232044921472. Its totient is φ = 43659244800000.

The previous prime is 121221021219979. The next prime is 121221021220051. The reversal of 121221021220000 is 22120122121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 136664059557 + ... + 136664060443.

Almost surely, 2^{121221021220000} is an apocalyptic number.

121221021220000 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 121221021220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164616022460736).

121221021220000 is an abundant number, since it is smaller than the sum of its proper divisors (208011023701472).

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

121221021220000 is an equidigital number, since it uses as much as digits as its factorization.

121221021220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199 (or 1117 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121221021220000 its reverse (22120122121), we get a palindrome (121243141342121).

The spelling of 121221021220000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty thousand".