100001022221 has 2 divisors, whose sum is σ = 100001022222. Its totient is φ = 100001022220.

The previous prime is 100001022203. The next prime is 100001022227. The reversal of 100001022221 is 122220100001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57929269225 + 42071752996 = 240685^2 + 205114^2 .

It is a cyclic number.

It is not a de Polignac number, because 100001022221 - 2⁶ = 100001022157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100001022227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000511110 + 50000511111.

It is an arithmetic number, because the mean of its divisors is an integer number (50000511111).

Almost surely, 2^100001022221 is an apocalyptic number.

It is an amenable number.

100001022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001022221 is an equidigital number, since it uses as much as digits as its factorization.

100001022221 is an evil number, because the sum of its binary digits is even.

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

Adding to 100001022221 its reverse (122220100001), we get a palindrome (222221122222).

The spelling of 100001022221 in words is "one hundred billion, one million, twenty-two thousand, two hundred twenty-one".