12020020101 has 24 divisors (see below), whose sum is σ = 17669457624. Its totient is φ = 7872768000.

The previous prime is 12020020099. The next prime is 12020020109. The reversal of 12020020101 is 10102002021.

It can be written as a sum of positive squares in 4 ways, for example, as 586850625 + 11433169476 = 24225^2 + 106926^2 .

It is not a de Polignac number, because 12020020101 - 2¹ = 12020020099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020020109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69351 + ... + 169851.

It is an arithmetic number, because the mean of its divisors is an integer number (736227401).

Almost surely, 2^12020020101 is an apocalyptic number.

It is an amenable number.

12020020101 is a deficient number, since it is larger than the sum of its proper divisors (5649437523).

12020020101 is a wasteful number, since it uses less digits than its factorization.

12020020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100741 (or 100738 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12020020101 its reverse (10102002021), we get a palindrome (22122022122).

The spelling of 12020020101 in words is "twelve billion, twenty million, twenty thousand, one hundred one".