222121023217 has 2 divisors, whose sum is σ = 222121023218. Its totient is φ = 222121023216.

The previous prime is 222121023143. The next prime is 222121023221. The reversal of 222121023217 is 712320121222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211154954256 + 10966068961 = 459516^2 + 104719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222121023217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222121023191 and 222121023200.

It is not a weakly prime, because it can be changed into another prime (222121023227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060511608 + 111060511609.

It is an arithmetic number, because the mean of its divisors is an integer number (111060511609).

Almost surely, 2^222121023217 is an apocalyptic number.

It is an amenable number.

222121023217 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121023217 is an equidigital number, since it uses as much as digits as its factorization.

222121023217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 222121023217 its reverse (712320121222), we get a palindrome (934441144439).

The spelling of 222121023217 in words is "two hundred twenty-two billion, one hundred twenty-one million, twenty-three thousand, two hundred seventeen".