202020111001 has 6 divisors (see below), whose sum is σ = 211185485210. Its totient is φ = 193236627408.

The previous prime is 202020110989. The next prime is 202020111017. The reversal of 202020111001 is 100111020202.

It can be written as a sum of positive squares in only one way, i.e., 181441921600 + 20578189401 = 425960^2 + 143451^2 .

It is not a de Polignac number, because 202020111001 - 2²¹ = 202018013849 is a prime.

It is a super-2 number, since 2×202020111001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202020111071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 190944756 + ... + 190945813.

Almost surely, 2^202020111001 is an apocalyptic number.

It is an amenable number.

202020111001 is a deficient number, since it is larger than the sum of its proper divisors (9165374209).

202020111001 is an equidigital number, since it uses as much as digits as its factorization.

202020111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381890615 (or 381890592 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 202020111001 its reverse (100111020202), we get a palindrome (302131131203).

The spelling of 202020111001 in words is "two hundred two billion, twenty million, one hundred eleven thousand, one".