101220031217 has 2 divisors, whose sum is σ = 101220031218. Its totient is φ = 101220031216.

The previous prime is 101220031189. The next prime is 101220031247. The reversal of 101220031217 is 712130022101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100923123856 + 296907361 = 317684^2 + 17231^2 .

It is a cyclic number.

It is not a de Polignac number, because 101220031217 - 2¹² = 101220027121 is a prime.

It is not a weakly prime, because it can be changed into another prime (101220031247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610015608 + 50610015609.

It is an arithmetic number, because the mean of its divisors is an integer number (50610015609).

Almost surely, 2^101220031217 is an apocalyptic number.

It is an amenable number.

101220031217 is a deficient number, since it is larger than the sum of its proper divisors (1).

101220031217 is an equidigital number, since it uses as much as digits as its factorization.

101220031217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 101220031217 its reverse (712130022101), we get a palindrome (813350053318).

The spelling of 101220031217 in words is "one hundred one billion, two hundred twenty million, thirty-one thousand, two hundred seventeen".