2100012012020 has 36 divisors (see below), whose sum is σ = 4775352766380. Its totient is φ = 775389049344.

The previous prime is 2100012012013. The next prime is 2100012012061. The reversal of 2100012012020 is 202102100012.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 456211088356 + 1643800923664 = 675434^2 + 1282108^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2100012011992 and 2100012012010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310649285 + ... + 310656044.

It is an arithmetic number, because the mean of its divisors is an integer number (132648687955).

Almost surely, 2^{2100012012020} is an apocalyptic number.

2100012012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100012012020 is an abundant number, since it is smaller than the sum of its proper divisors (2675340754360).

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

2100012012020 is a wasteful number, since it uses less digits than its factorization.

2100012012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621305364 (or 621305349 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2100012012020 its reverse (202102100012), we get a palindrome (2302114112032).

The spelling of 2100012012020 in words is "two trillion, one hundred billion, twelve million, twelve thousand, twenty".