2101230221 has 4 divisors (see below), whose sum is σ = 2101331232. Its totient is φ = 2101129212.

The previous prime is 2101230203. The next prime is 2101230223. The reversal of 2101230221 is 1220321012.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2101230221 - 2¹⁴ = 2101213837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101230196 and 2101230205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101230223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6551 + ... + 65156.

It is an arithmetic number, because the mean of its divisors is an integer number (525332808).

Almost surely, 2^2101230221 is an apocalyptic number.

It is an amenable number.

2101230221 is a deficient number, since it is larger than the sum of its proper divisors (101011).

2101230221 is an equidigital number, since it uses as much as digits as its factorization.

2101230221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101010.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2101230221 is about 45839.1777958549. The cubic root of 2101230221 is about 1280.8291789317.

Adding to 2101230221 its reverse (1220321012), we get a palindrome (3321551233).

The spelling of 2101230221 in words is "two billion, one hundred one million, two hundred thirty thousand, two hundred twenty-one".