2021100002221 has 8 divisors (see below), whose sum is σ = 2049598850040. Its totient is φ = 1992729818112.

The previous prime is 2021100002203. The next prime is 2021100002237. The reversal of 2021100002221 is 1222000011202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7933464900 + 2013166537321 = 89070^2 + 1418861^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2021100002221 - 2¹⁹ = 2021099477933 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 (2021100002261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32134290 + ... + 32197123.

It is an arithmetic number, because the mean of its divisors is an integer number (256199856255).

Almost surely, 2^{2021100002221} is an apocalyptic number.

It is an amenable number.

2021100002221 is a deficient number, since it is larger than the sum of its proper divisors (28498847819).

2021100002221 is an equidigital number, since it uses as much as digits as its factorization.

2021100002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64331855.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2021100002221 its reverse (1222000011202), we get a palindrome (3243100013423).

The spelling of 2021100002221 in words is "two trillion, twenty-one billion, one hundred million, two thousand, two hundred twenty-one".