2021100011221 has 4 divisors (see below), whose sum is σ = 2022409863712. Its totient is φ = 2019790158732.

The previous prime is 2021100011207. The next prime is 2021100011239. The reversal of 2021100011221 is 1221100011202.

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 not a de Polignac number, because 2021100011221 - 2⁷ = 2021100011093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021100011251) 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, 654923931 + ... + 654927016.

It is an arithmetic number, because the mean of its divisors is an integer number (505602465928).

Almost surely, 2^{2021100011221} is an apocalyptic number.

It is an amenable number.

2021100011221 is a deficient number, since it is larger than the sum of its proper divisors (1309852491).

2021100011221 is a wasteful number, since it uses less digits than its factorization.

2021100011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309852490.

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

Adding to 2021100011221 its reverse (1221100011202), we get a palindrome (3242200022423).

The spelling of 2021100011221 in words is "two trillion, twenty-one billion, one hundred million, eleven thousand, two hundred twenty-one".