20100100002221 has 2 divisors, whose sum is σ = 20100100002222. Its totient is φ = 20100100002220.

The previous prime is 20100100002187. The next prime is 20100100002253. The reversal of 20100100002221 is 12220000100102.

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., 16136377374121 + 3963722628100 = 4017011^2 + 1990910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20100100002221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20100100002721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050050001110 + 10050050001111.

It is an arithmetic number, because the mean of its divisors is an integer number (10050050001111).

Almost surely, 2^{20100100002221} is an apocalyptic number.

It is an amenable number.

20100100002221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100100002221 is an equidigital number, since it uses as much as digits as its factorization.

20100100002221 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 20100100002221 its reverse (12220000100102), we get a palindrome (32320100102323).

The spelling of 20100100002221 in words is "twenty trillion, one hundred billion, one hundred million, two thousand, two hundred twenty-one".