2021002112021 has 4 divisors (see below), whose sum is σ = 2023457765472. Its totient is φ = 2018546458572.

The previous prime is 2021002111991. The next prime is 2021002112033. The reversal of 2021002112021 is 1202112001202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021002112021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021002111987 and 2021002112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021002112821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1227825491 + ... + 1227827136.

It is an arithmetic number, because the mean of its divisors is an integer number (505864441368).

Almost surely, 2^{2021002112021} is an apocalyptic number.

It is an amenable number.

2021002112021 is a deficient number, since it is larger than the sum of its proper divisors (2455653451).

2021002112021 is an equidigital number, since it uses as much as digits as its factorization.

2021002112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455653450.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2021002112021 its reverse (1202112001202), we get a palindrome (3223114113223).

The spelling of 2021002112021 in words is "two trillion, twenty-one billion, two million, one hundred twelve thousand, twenty-one".