20210212117 has 2 divisors, whose sum is σ = 20210212118. Its totient is φ = 20210212116.

The previous prime is 20210212097. The next prime is 20210212147. The reversal of 20210212117 is 71121201202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18568422756 + 1641789361 = 136266^2 + 40519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210212117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210212094 and 20210212103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210212147) 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, 10105106058 + 10105106059.

It is an arithmetic number, because the mean of its divisors is an integer number (10105106059).

Almost surely, 2^20210212117 is an apocalyptic number.

It is an amenable number.

20210212117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210212117 is an equidigital number, since it uses as much as digits as its factorization.

20210212117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 20210212117 its reverse (71121201202), we get a palindrome (91331413319).

The spelling of 20210212117 in words is "twenty billion, two hundred ten million, two hundred twelve thousand, one hundred seventeen".