2102241221 has 4 divisors (see below), whose sum is σ = 2102567244. Its totient is φ = 2101915200.

The previous prime is 2102241151. The next prime is 2102241259. The reversal of 2102241221 is 1221422012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 450712900 + 1651528321 = 21230^2 + 40639^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102241221 - 2²² = 2098046917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102241221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101241221) 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, 153140 + ... + 166301.

It is an arithmetic number, because the mean of its divisors is an integer number (525641811).

Almost surely, 2^2102241221 is an apocalyptic number.

It is an amenable number.

2102241221 is a deficient number, since it is larger than the sum of its proper divisors (326023).

2102241221 is an equidigital number, since it uses as much as digits as its factorization.

2102241221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326022.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2102241221 is about 45850.2041543983. The cubic root of 2102241221 is about 1281.0345682414.

Adding to 2102241221 its reverse (1221422012), we get a palindrome (3323663233).

The spelling of 2102241221 in words is "two billion, one hundred two million, two hundred forty-one thousand, two hundred twenty-one".