2101002221 has 4 divisors (see below), whose sum is σ = 2103166944. Its totient is φ = 2098837500.

The previous prime is 2101002193. The next prime is 2101002223. The reversal of 2101002221 is 1222001012.

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.

It is a cyclic number.

It is not a de Polignac number, because 2101002221 - 2¹⁰ = 2101001197 is a prime.

It is a super-3 number, since 3×2101002221³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101002223) 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, 1080905 + ... + 1082846.

It is an arithmetic number, because the mean of its divisors is an integer number (525791736).

Almost surely, 2^2101002221 is an apocalyptic number.

It is an amenable number.

2101002221 is a deficient number, since it is larger than the sum of its proper divisors (2164723).

2101002221 is an equidigital number, since it uses as much as digits as its factorization.

2101002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164722.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2101002221 is about 45836.6907727859. The cubic root of 2101002221 is about 1280.7828505772.

Adding to 2101002221 its reverse (1222001012), we get a palindrome (3323003233).

The spelling of 2101002221 in words is "two billion, one hundred one million, two thousand, two hundred twenty-one".