121221111210000 has 100 divisors (see below), whose sum is σ = 391317909897552. Its totient is φ = 32325629648000.

The previous prime is 121221111209959. The next prime is 121221111210007. The reversal of 121221111210000 is 12111122121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (121221111210007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2020321854 + ... + 2020381853.

Almost surely, 2^{121221111210000} is an apocalyptic number.

121221111210000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221111210000 is an abundant number, since it is smaller than the sum of its proper divisors (270096798687552).

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

121221111210000 is an equidigital number, since it uses as much as digits as its factorization.

121221111210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040703738 (or 4040703717 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121221111210000 its reverse (12111122121), we get a palindrome (121233222332121).

The spelling of 121221111210000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred ten thousand".