2021111002021 has 4 divisors (see below), whose sum is σ = 2021121795852. Its totient is φ = 2021100208192.

The previous prime is 2021111002003. The next prime is 2021111002033. The reversal of 2021111002021 is 1202001111202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1739006613796 + 282104388225 = 1318714^2 + 531135^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021111002021 - 2⁵ = 2021111001989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021111001992 and 2021111002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021111402021) 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 3 ways as a sum of consecutive naturals, for example, 5110996 + ... + 5492221.

It is an arithmetic number, because the mean of its divisors is an integer number (505280448963).

Almost surely, 2^{2021111002021} is an apocalyptic number.

It is an amenable number.

2021111002021 is a deficient number, since it is larger than the sum of its proper divisors (10793831).

2021111002021 is a wasteful number, since it uses less digits than its factorization.

2021111002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10793830.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2021111002021 its reverse (1202001111202), we get a palindrome (3223112113223).

The spelling of 2021111002021 in words is "two trillion, twenty-one billion, one hundred eleven million, two thousand, twenty-one".