20021012001217 has 2 divisors, whose sum is σ = 20021012001218. Its totient is φ = 20021012001216.

The previous prime is 20021012001197. The next prime is 20021012001251. The reversal of 20021012001217 is 71210021012002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13393909133361 + 6627102867856 = 3659769^2 + 2574316^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021012001217 - 2³⁵ = 19986652262849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021012001194 and 20021012001203.

It is not a weakly prime, because it can be changed into another prime (20021012061217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010506000608 + 10010506000609.

It is an arithmetic number, because the mean of its divisors is an integer number (10010506000609).

Almost surely, 2^{20021012001217} is an apocalyptic number.

It is an amenable number.

20021012001217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021012001217 is an equidigital number, since it uses as much as digits as its factorization.

20021012001217 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 20021012001217 its reverse (71210021012002), we get a palindrome (91231033013219).

The spelling of 20021012001217 in words is "twenty trillion, twenty-one billion, twelve million, one thousand, two hundred seventeen".