2021121000020 has 24 divisors (see below), whose sum is σ = 4244427075168. Its totient is φ = 808434500000.

The previous prime is 2021120999999. The next prime is 2021121000091. The reversal of 2021121000020 is 200001211202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2021120999965 and 2021121000010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366395 + ... + 2043645.

It is an arithmetic number, because the mean of its divisors is an integer number (176851128132).

Almost surely, 2^{2021121000020} is an apocalyptic number.

2021121000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021121000020 is an abundant number, since it is smaller than the sum of its proper divisors (2223306075148).

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

2021121000020 is a wasteful number, since it uses less digits than its factorization.

2021121000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737511 (or 1737509 counting only the distinct ones).

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

Adding to 2021121000020 its reverse (200001211202), we get a palindrome (2221122211222).

The spelling of 2021121000020 in words is "two trillion, twenty-one billion, one hundred twenty-one million, twenty", and thus it is an aban number.