20000100212221 has 2 divisors, whose sum is σ = 20000100212222. Its totient is φ = 20000100212220.

The previous prime is 20000100212171. The next prime is 20000100212231. The reversal of 20000100212221 is 12221200100002.

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., 10050554808121 + 9949545404100 = 3170261^2 + 3154290^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000100212221 - 2²¹ = 20000098115069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20000100212231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000050106110 + 10000050106111.

It is an arithmetic number, because the mean of its divisors is an integer number (10000050106111).

Almost surely, 2^{20000100212221} is an apocalyptic number.

It is an amenable number.

20000100212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000100212221 is an equidigital number, since it uses as much as digits as its factorization.

20000100212221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20000100212221 its reverse (12221200100002), we get a palindrome (32221300312223).

The spelling of 20000100212221 in words is "twenty trillion, one hundred million, two hundred twelve thousand, two hundred twenty-one".