20021222017 has 2 divisors, whose sum is σ = 20021222018. Its totient is φ = 20021222016.

The previous prime is 20021221991. The next prime is 20021222041. The reversal of 20021222017 is 71022212002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19021650561 + 999571456 = 137919^2 + 31616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021222017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021221985 and 20021222003.

It is not a weakly prime, because it can be changed into another prime (20021222077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010611008 + 10010611009.

It is an arithmetic number, because the mean of its divisors is an integer number (10010611009).

Almost surely, 2^20021222017 is an apocalyptic number.

It is an amenable number.

20021222017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021222017 is an equidigital number, since it uses as much as digits as its factorization.

20021222017 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 19.

Adding to 20021222017 its reverse (71022212002), we get a palindrome (91043434019).

The spelling of 20021222017 in words is "twenty billion, twenty-one million, two hundred twenty-two thousand, seventeen".