20210100122221 has 2 divisors, whose sum is σ = 20210100122222. Its totient is φ = 20210100122220.

The previous prime is 20210100122161. The next prime is 20210100122227. The reversal of 20210100122221 is 12222100101202.

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., 19903322606596 + 306777515625 = 4461314^2 + 553875^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210100122221 - 2¹¹ = 20210100120173 is a prime.

It is a super-3 number, since 3×20210100122221³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20210100122195 and 20210100122204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210100122227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105050061110 + 10105050061111.

It is an arithmetic number, because the mean of its divisors is an integer number (10105050061111).

Almost surely, 2^{20210100122221} is an apocalyptic number.

It is an amenable number.

20210100122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210100122221 is an equidigital number, since it uses as much as digits as its factorization.

20210100122221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20210100122221 its reverse (12222100101202), we get a palindrome (32432200223423).

The spelling of 20210100122221 in words is "twenty trillion, two hundred ten billion, one hundred million, one hundred twenty-two thousand, two hundred twenty-one".