2021001111021 has 16 divisors (see below), whose sum is σ = 2748192552000. Its totient is φ = 1320702739968.

The previous prime is 2021001111011. The next prime is 2021001111053. The reversal of 2021001111021 is 1201111001202.

It is not a de Polignac number, because 2021001111021 - 2⁹ = 2021001110509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021001110988 and 2021001111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021001111011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16296516 + ... + 16420061.

It is an arithmetic number, because the mean of its divisors is an integer number (171762034500).

Almost surely, 2^{2021001111021} is an apocalyptic number.

It is an amenable number.

2021001111021 is a deficient number, since it is larger than the sum of its proper divisors (727191440979).

2021001111021 is a wasteful number, since it uses less digits than its factorization.

2021001111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32716988.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2021001111021 its reverse (1201111001202), we get a palindrome (3222112112223).

The spelling of 2021001111021 in words is "two trillion, twenty-one billion, one million, one hundred eleven thousand, twenty-one".