2021112101221 has 4 divisors (see below), whose sum is σ = 2021364401344. Its totient is φ = 2020859801100.

The previous prime is 2021112101189. The next prime is 2021112101243. The reversal of 2021112101221 is 1221012111202.

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 2021112101221 - 2⁵ = 2021112101189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021112101195 and 2021112101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021112101321) 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, 126138045 + ... + 126154066.

It is an arithmetic number, because the mean of its divisors is an integer number (505341100336).

Almost surely, 2^{2021112101221} is an apocalyptic number.

It is an amenable number.

2021112101221 is a deficient number, since it is larger than the sum of its proper divisors (252300123).

2021112101221 is an equidigital number, since it uses as much as digits as its factorization.

2021112101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252300122.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2021112101221 its reverse (1221012111202), we get a palindrome (3242124212423).

The spelling of 2021112101221 in words is "two trillion, twenty-one billion, one hundred twelve million, one hundred one thousand, two hundred twenty-one".