20021020101 has 16 divisors (see below), whose sum is σ = 29663275200. Its totient is φ = 13346219664.

The previous prime is 20021020091. The next prime is 20021020109. The reversal of 20021020101 is 10102012002.

It is not a de Polignac number, because 20021020101 - 2⁷ = 20021019973 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 (20021020109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404815 + ... + 451571.

It is an arithmetic number, because the mean of its divisors is an integer number (1853954700).

Almost surely, 2^20021020101 is an apocalyptic number.

It is an amenable number.

20021020101 is a deficient number, since it is larger than the sum of its proper divisors (9642255099).

20021020101 is a wasteful number, since it uses less digits than its factorization.

20021020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62625 (or 62619 counting only the distinct ones).

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

Adding to 20021020101 its reverse (10102012002), we get a palindrome (30123032103).

The spelling of 20021020101 in words is "twenty billion, twenty-one million, twenty thousand, one hundred one".