1020020201 has 2 divisors, whose sum is σ = 1020020202. Its totient is φ = 1020020200.

The previous prime is 1020020173. The next prime is 1020020231. The reversal of 1020020201 is 1020200201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 692952976 + 327067225 = 26324^2 + 18085^2 .

It is an emirp because it is prime and its reverse (1020200201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020020201 - 2⁶ = 1020020137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020020231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510010100 + 510010101.

It is an arithmetic number, because the mean of its divisors is an integer number (510010101).

Almost surely, 2^1020020201 is an apocalyptic number.

It is an amenable number.

1020020201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020020201 is an equidigital number, since it uses as much as digits as its factorization.

1020020201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1020020201 is about 31937.7551026994. The cubic root of 1020020201 is about 1006.6293548709.

Adding to 1020020201 its reverse (1020200201), we get a palindrome (2040220402).

The spelling of 1020020201 in words is "one billion, twenty million, twenty thousand, two hundred one".