20210222121917 has 2 divisors, whose sum is σ = 20210222121918. Its totient is φ = 20210222121916.

The previous prime is 20210222121853. The next prime is 20210222122001. The reversal of 20210222121917 is 71912122201202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14321766616921 + 5888455504996 = 3784411^2 + 2426614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210222121917 - 2⁶ = 20210222121853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210222121217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105111060958 + 10105111060959.

It is an arithmetic number, because the mean of its divisors is an integer number (10105111060959).

Almost surely, 2^{20210222121917} is an apocalyptic number.

It is an amenable number.

20210222121917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210222121917 is an equidigital number, since it uses as much as digits as its factorization.

20210222121917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 20210222121917 in words is "twenty trillion, two hundred ten billion, two hundred twenty-two million, one hundred twenty-one thousand, nine hundred seventeen".