20010221017 has 4 divisors (see below), whose sum is σ = 20034956340. Its totient is φ = 19985485696.

The previous prime is 20010220987. The next prime is 20010221039. The reversal of 20010221017 is 71012201002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8455905936 + 11554315081 = 91956^2 + 107491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010221017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010221047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12366448 + ... + 12368065.

It is an arithmetic number, because the mean of its divisors is an integer number (5008739085).

Almost surely, 2^20010221017 is an apocalyptic number.

It is an amenable number.

20010221017 is a deficient number, since it is larger than the sum of its proper divisors (24735323).

20010221017 is an equidigital number, since it uses as much as digits as its factorization.

20010221017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24735322.

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

Adding to 20010221017 its reverse (71012201002), we get a palindrome (91022422019).

The spelling of 20010221017 in words is "twenty billion, ten million, two hundred twenty-one thousand, seventeen".