20210101217 has 2 divisors, whose sum is σ = 20210101218. Its totient is φ = 20210101216.

The previous prime is 20210101199. The next prime is 20210101229. The reversal of 20210101217 is 71210101202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18354559441 + 1855541776 = 135479^2 + 43076^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210101217 - 2⁸ = 20210100961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210101195 and 20210101204.

It is not a weakly prime, because it can be changed into another prime (20210101237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105050608 + 10105050609.

It is an arithmetic number, because the mean of its divisors is an integer number (10105050609).

Almost surely, 2^20210101217 is an apocalyptic number.

It is an amenable number.

20210101217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210101217 is an equidigital number, since it uses as much as digits as its factorization.

20210101217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 20210101217 its reverse (71210101202), we get a palindrome (91420202419).

The spelling of 20210101217 in words is "twenty billion, two hundred ten million, one hundred one thousand, two hundred seventeen".