2021000121021 has 24 divisors (see below), whose sum is σ = 3235728969984. Its totient is φ = 1117603751040.

The previous prime is 2021000120987. The next prime is 2021000121031. The reversal of 2021000121021 is 1201210001202.

It is not a de Polignac number, because 2021000121021 - 2²⁷ = 2020865903293 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2021000120988 and 2021000121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021000121031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221742220 + ... + 221751333.

It is an arithmetic number, because the mean of its divisors is an integer number (134822040416).

Almost surely, 2^{2021000121021} is an apocalyptic number.

2021000121021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2021000121021 is a deficient number, since it is larger than the sum of its proper divisors (1214728848963).

2021000121021 is a wasteful number, since it uses less digits than its factorization.

2021000121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443493601 (or 443493594 counting only the distinct ones).

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

Adding to 2021000121021 its reverse (1201210001202), we get a palindrome (3222210122223).

The spelling of 2021000121021 in words is "two trillion, twenty-one billion, one hundred twenty-one thousand, twenty-one".