12021012010020 has 144 divisors (see below), whose sum is σ = 36467320502592. Its totient is φ = 2957379909120.

The previous prime is 12021012010003. The next prime is 12021012010079. The reversal of 12021012010020 is 2001021012021.

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 = 12021012009978 and 12021012010005.

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, 18036234 + ... + 18690846.

It is an arithmetic number, because the mean of its divisors is an integer number (253245281268).

Almost surely, 2^{12021012010020} is an apocalyptic number.

12021012010020 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 12021012010020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18233660251296).

12021012010020 is an abundant number, since it is smaller than the sum of its proper divisors (24446308492572).

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

12021012010020 is a wasteful number, since it uses less digits than its factorization.

12021012010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656462 (or 656447 counting only the distinct ones).

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

Adding to 12021012010020 its reverse (2001021012021), we get a palindrome (14022033022041).

The spelling of 12021012010020 in words is "twelve trillion, twenty-one billion, twelve million, ten thousand, twenty".