2110221021 has 4 divisors (see below), whose sum is σ = 2813628032. Its totient is φ = 1406814012.

The previous prime is 2110221011. The next prime is 2110221053. The reversal of 2110221021 is 1201220112.

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 not a de Polignac number, because 2110221021 - 2²⁵ = 2076666589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2110220988 and 2110221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2110221011) 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, 351703501 + ... + 351703506.

It is an arithmetic number, because the mean of its divisors is an integer number (703407008).

Almost surely, 2^2110221021 is an apocalyptic number.

It is an amenable number.

2110221021 is a deficient number, since it is larger than the sum of its proper divisors (703407011).

2110221021 is an equidigital number, since it uses as much as digits as its factorization.

2110221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703407010.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2110221021 is about 45937.1420639116. The cubic root of 2110221021 is about 1282.6533949342.

Adding to 2110221021 its reverse (1201220112), we get a palindrome (3311441133).

Subtracting from 2110221021 its reverse (1201220112), we obtain a palindrome (909000909).

The spelling of 2110221021 in words is "two billion, one hundred ten million, two hundred twenty-one thousand, twenty-one".