12121020100 has 144 divisors (see below), whose sum is σ = 30564043776. Its totient is φ = 4086720000.

The previous prime is 12121020089. The next prime is 12121020133. The reversal of 12121020100 is 102012121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12230605 + ... + 12231595.

It is an arithmetic number, because the mean of its divisors is an integer number (212250304).

Almost surely, 2^12121020100 is an apocalyptic number.

12121020100 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 12121020100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15282021888).

12121020100 is an abundant number, since it is smaller than the sum of its proper divisors (18443023676).

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

12121020100 is a wasteful number, since it uses less digits than its factorization.

12121020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1279 counting only the distinct ones).

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

Adding to 12121020100 its reverse (102012121), we get a palindrome (12223032221).

The spelling of 12121020100 in words is "twelve billion, one hundred twenty-one million, twenty thousand, one hundred".