20201001217 has 2 divisors, whose sum is σ = 20201001218. Its totient is φ = 20201001216.

The previous prime is 20201001211. The next prime is 20201001241. The reversal of 20201001217 is 71210010202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12940427536 + 7260573681 = 113756^2 + 85209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201001217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20201001217.

It is not a weakly prime, because it can be changed into another prime (20201001211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100500608 + 10100500609.

It is an arithmetic number, because the mean of its divisors is an integer number (10100500609).

Almost surely, 2^20201001217 is an apocalyptic number.

It is an amenable number.

20201001217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201001217 is an equidigital number, since it uses as much as digits as its factorization.

20201001217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 20201001217 its reverse (71210010202), we get a palindrome (91411011419).

The spelling of 20201001217 in words is "twenty billion, two hundred one million, one thousand, two hundred seventeen".