20100102221 has 2 divisors, whose sum is σ = 20100102222. Its totient is φ = 20100102220.

The previous prime is 20100102199. The next prime is 20100102229. The reversal of 20100102221 is 12220100102.

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., 16643838121 + 3456264100 = 129011^2 + 58790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20100102221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20100102229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050051110 + 10050051111.

It is an arithmetic number, because the mean of its divisors is an integer number (10050051111).

Almost surely, 2^20100102221 is an apocalyptic number.

It is an amenable number.

20100102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100102221 is an equidigital number, since it uses as much as digits as its factorization.

20100102221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20100102221 its reverse (12220100102), we get a palindrome (32320202323).

The spelling of 20100102221 in words is "twenty billion, one hundred million, one hundred two thousand, two hundred twenty-one".