21220122020117 has 2 divisors, whose sum is σ = 21220122020118. Its totient is φ = 21220122020116.

The previous prime is 21220122020099. The next prime is 21220122020131. The reversal of 21220122020117 is 71102022102212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16313892590116 + 4906229430001 = 4039046^2 + 2215001^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220122020117 - 2¹⁰ = 21220122019093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220122020092 and 21220122020101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220122020137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610061010058 + 10610061010059.

It is an arithmetic number, because the mean of its divisors is an integer number (10610061010059).

Almost surely, 2^{21220122020117} is an apocalyptic number.

It is an amenable number.

21220122020117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220122020117 is an equidigital number, since it uses as much as digits as its factorization.

21220122020117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21220122020117 its reverse (71102022102212), we get a palindrome (92322144122329).

The spelling of 21220122020117 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, twenty thousand, one hundred seventeen".