2021101110221 has 4 divisors (see below), whose sum is σ = 2032783775772. Its totient is φ = 2009418444672.

The previous prime is 2021101110211. The next prime is 2021101110227. The reversal of 2021101110221 is 1220111011202.

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 1375954806121 + 645146304100 = 1173011^2 + 803210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021101110221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021101110196 and 2021101110205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021101110227) 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, 5841332516 + ... + 5841332861.

It is an arithmetic number, because the mean of its divisors is an integer number (508195943943).

Almost surely, 2^{2021101110221} is an apocalyptic number.

It is an amenable number.

2021101110221 is a deficient number, since it is larger than the sum of its proper divisors (11682665551).

2021101110221 is a wasteful number, since it uses less digits than its factorization.

2021101110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11682665550.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2021101110221 its reverse (1220111011202), we get a palindrome (3241212121423).

The spelling of 2021101110221 in words is "two trillion, twenty-one billion, one hundred one million, one hundred ten thousand, two hundred twenty-one".