12021102100020 has 48 divisors (see below), whose sum is σ = 36248246334720. Its totient is φ = 2959040516736.

The previous prime is 12021102099991. The next prime is 12021102100027. The reversal of 12021102100020 is 2000120112021.

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

It is a junction number, because it is equal to n+sod(n) for n = 12021102099969 and 12021102100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021102100027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7705833900 + ... + 7705835459.

It is an arithmetic number, because the mean of its divisors is an integer number (755171798640).

Almost surely, 2^{12021102100020} is an apocalyptic number.

12021102100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021102100020 is an abundant number, since it is smaller than the sum of its proper divisors (24227144234700).

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

12021102100020 is a wasteful number, since it uses less digits than its factorization.

12021102100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15411669384 (or 15411669382 counting only the distinct ones).

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

Adding to 12021102100020 its reverse (2000120112021), we get a palindrome (14021222212041).

The spelling of 12021102100020 in words is "twelve trillion, twenty-one billion, one hundred two million, one hundred thousand, twenty".