21222021023117 has 2 divisors, whose sum is σ = 21222021023118. Its totient is φ = 21222021023116.

The previous prime is 21222021023101. The next prime is 21222021023141. The reversal of 21222021023117 is 71132012022212.

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., 15182759008036 + 6039262015081 = 3896506^2 + 2457491^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222021023117 - 2⁴ = 21222021023101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222021023167) 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, 10611010511558 + 10611010511559.

It is an arithmetic number, because the mean of its divisors is an integer number (10611010511559).

Almost surely, 2^{21222021023117} is an apocalyptic number.

It is an amenable number.

21222021023117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222021023117 is an equidigital number, since it uses as much as digits as its factorization.

21222021023117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21222021023117 its reverse (71132012022212), we get a palindrome (92354033045329).

The spelling of 21222021023117 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, twenty-three thousand, one hundred seventeen".