20021000117 has 2 divisors, whose sum is σ = 20021000118. Its totient is φ = 20021000116.

The previous prime is 20021000101. The next prime is 20021000161. The reversal of 20021000117 is 71100012002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13305853201 + 6715146916 = 115351^2 + 81946^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021000117 - 2⁴ = 20021000101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021000617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010500058 + 10010500059.

It is an arithmetic number, because the mean of its divisors is an integer number (10010500059).

Almost surely, 2^20021000117 is an apocalyptic number.

It is an amenable number.

20021000117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021000117 is an equidigital number, since it uses as much as digits as its factorization.

20021000117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

Adding to 20021000117 its reverse (71100012002), we get a palindrome (91121012119).

The spelling of 20021000117 in words is "twenty billion, twenty-one million, one hundred seventeen", and thus it is an aban number.