22001211217 has 2 divisors, whose sum is σ = 22001211218. Its totient is φ = 22001211216.

The previous prime is 22001211191. The next prime is 22001211233. The reversal of 22001211217 is 71211210022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13980934081 + 8020277136 = 118241^2 + 89556^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001211217 - 2¹¹ = 22001209169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22001211194 and 22001211203.

It is not a weakly prime, because it can be changed into another prime (22001011217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000605608 + 11000605609.

It is an arithmetic number, because the mean of its divisors is an integer number (11000605609).

Almost surely, 2^22001211217 is an apocalyptic number.

It is an amenable number.

22001211217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001211217 is an equidigital number, since it uses as much as digits as its factorization.

22001211217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 22001211217 its reverse (71211210022), we get a palindrome (93212421239).

The spelling of 22001211217 in words is "twenty-two billion, one million, two hundred eleven thousand, two hundred seventeen".