2102522221 has 2 divisors, whose sum is σ = 2102522222. Its totient is φ = 2102522220.

The previous prime is 2102522179. The next prime is 2102522251. The reversal of 2102522221 is 1222252012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1225770121 + 876752100 = 35011^2 + 29610^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102522221 - 2²¹ = 2100425069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102522251) 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 as a sum of consecutive naturals, namely, 1051261110 + 1051261111.

It is an arithmetic number, because the mean of its divisors is an integer number (1051261111).

Almost surely, 2^2102522221 is an apocalyptic number.

It is an amenable number.

2102522221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102522221 is an equidigital number, since it uses as much as digits as its factorization.

2102522221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 2102522221 is about 45853.2683786009. The cubic root of 2102522221 is about 1281.0916429913.

Adding to 2102522221 its reverse (1222252012), we get a palindrome (3324774233).

The spelling of 2102522221 in words is "two billion, one hundred two million, five hundred twenty-two thousand, two hundred twenty-one".