121221001020000 has 360 divisors, whose sum is σ = 462548179996056. Its totient is φ = 27707656704000.

The previous prime is 121221001019969. The next prime is 121221001020001. The reversal of 121221001020000 is 20100122121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221001020001) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 17675817 + ... + 23555816.

Almost surely, 2^{121221001020000} is an apocalyptic number.

121221001020000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221001020000 is an abundant number, since it is smaller than the sum of its proper divisors (341327178976056).

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

121221001020000 is an equidigital number, since it uses as much as digits as its factorization.

121221001020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41231680 (or 41231650 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121221001020000 its reverse (20100122121), we get a palindrome (121241101142121).

The spelling of 121221001020000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one million, twenty thousand".