21022112117 has 2 divisors, whose sum is σ = 21022112118. Its totient is φ = 21022112116.

The previous prime is 21022112101. The next prime is 21022112143. The reversal of 21022112117 is 71121122012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19001519716 + 2020592401 = 137846^2 + 44951^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022112117 - 2⁴ = 21022112101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022112197) 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, 10511056058 + 10511056059.

It is an arithmetic number, because the mean of its divisors is an integer number (10511056059).

Almost surely, 2^21022112117 is an apocalyptic number.

It is an amenable number.

21022112117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022112117 is an equidigital number, since it uses as much as digits as its factorization.

21022112117 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 20.

Adding to 21022112117 its reverse (71121122012), we get a palindrome (92143234129).

The spelling of 21022112117 in words is "twenty-one billion, twenty-two million, one hundred twelve thousand, one hundred seventeen".