121210020000100 has 72 divisors (see below), whose sum is σ = 265117832483840. Its totient is φ = 48098430011520.

The previous prime is 121210020000079. The next prime is 121210020000101. The reversal of 121210020000100 is 1000020012121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (121210020000101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162556327 + ... + 163300273.

Almost surely, 2^{121210020000100} is an apocalyptic number.

121210020000100 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 121210020000100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132558916241920).

121210020000100 is an abundant number, since it is smaller than the sum of its proper divisors (143907812483740).

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

121210020000100 is a wasteful number, since it uses less digits than its factorization.

121210020000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756917 (or 756910 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121210020000100 its reverse (1000020012121), we get a palindrome (122210040012221).

The spelling of 121210020000100 in words is "one hundred twenty-one trillion, two hundred ten billion, twenty million, one hundred", and thus it is an aban number.