21022112021117 has 2 divisors, whose sum is σ = 21022112021118. Its totient is φ = 21022112021116.

The previous prime is 21022112021023. The next prime is 21022112021147. The reversal of 21022112021117 is 71112021122012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11440771821241 + 9581340199876 = 3382421^2 + 3095374^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022112021117 - 2²⁴ = 21022095243901 is a prime.

It is a super-4 number, since 4×21022112021117⁴ (a number of 54 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022112021092 and 21022112021101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022112021147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511056010558 + 10511056010559.

It is an arithmetic number, because the mean of its divisors is an integer number (10511056010559).

Almost surely, 2^{21022112021117} is an apocalyptic number.

It is an amenable number.

21022112021117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022112021117 is an equidigital number, since it uses as much as digits as its factorization.

21022112021117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 21022112021117 its reverse (71112021122012), we get a palindrome (92134133143129).

The spelling of 21022112021117 in words is "twenty-one trillion, twenty-two billion, one hundred twelve million, twenty-one thousand, one hundred seventeen".