2012021000020 has 48 divisors (see below), whose sum is σ = 4299076622736. Its totient is φ = 790773120000.

The previous prime is 2012020999991. The next prime is 2012021000047. The reversal of 2012021000020 is 200001202102.

It can be written as a sum of positive squares in 8 ways, for example, as 31945104 + 2011989054916 = 5652^2 + 1418446^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2012020999970 and 2012021000006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271720 + ... + 2024320.

It is an arithmetic number, because the mean of its divisors is an integer number (89564096307).

Almost surely, 2^{2012021000020} is an apocalyptic number.

2012021000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2012021000020 is an abundant number, since it is smaller than the sum of its proper divisors (2287055622716).

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

2012021000020 is a wasteful number, since it uses less digits than its factorization.

2012021000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753612 (or 1753610 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 2012021000020 its reverse (200001202102), we get a palindrome (2212022202122).

The spelling of 2012021000020 in words is "two trillion, twelve billion, twenty-one million, twenty", and thus it is an aban number and an uban number.