1220231011217 has 2 divisors, whose sum is σ = 1220231011218. Its totient is φ = 1220231011216.

The previous prime is 1220231011127. The next prime is 1220231011229. The reversal of 1220231011217 is 7121101320221.

It is a happy number.

Together with previous prime (1220231011127) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1056627749776 + 163603261441 = 1027924^2 + 404479^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220231011217 - 2²⁰ = 1220229962641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220231011192 and 1220231011201.

It is not a weakly prime, because it can be changed into another prime (1220231011717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610115505608 + 610115505609.

It is an arithmetic number, because the mean of its divisors is an integer number (610115505609).

Almost surely, 2^{1220231011217} is an apocalyptic number.

It is an amenable number.

1220231011217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220231011217 is an equidigital number, since it uses as much as digits as its factorization.

1220231011217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 1220231011217 its reverse (7121101320221), we get a palindrome (8341332331438).

The spelling of 1220231011217 in words is "one trillion, two hundred twenty billion, two hundred thirty-one million, eleven thousand, two hundred seventeen".