2102202221 has 4 divisors (see below), whose sum is σ = 2402516832. Its totient is φ = 1801887612.

The previous prime is 2102202209. The next prime is 2102202233. The reversal of 2102202221 is 1222022012.

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 an interprime number because it is at equal distance from previous prime (2102202209) and next prime (2102202233).

It is not a de Polignac number, because 2102202221 - 2³⁰ = 1028460397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102202196 and 2102202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102232221) 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, 150157295 + ... + 150157308.

It is an arithmetic number, because the mean of its divisors is an integer number (600629208).

Almost surely, 2^2102202221 is an apocalyptic number.

It is an amenable number.

2102202221 is a deficient number, since it is larger than the sum of its proper divisors (300314611).

2102202221 is an equidigital number, since it uses as much as digits as its factorization.

2102202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300314610.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2102202221 is about 45849.7788544285. The cubic root of 2102202221 is about 1281.0266464329.

Adding to 2102202221 its reverse (1222022012), we get a palindrome (3324224233).

The spelling of 2102202221 in words is "two billion, one hundred two million, two hundred two thousand, two hundred twenty-one".