20102002101 has 6 divisors (see below), whose sum is σ = 29036225270. Its totient is φ = 13401334728.

The previous prime is 20102002079. The next prime is 20102002169. The reversal of 20102002101 is 10120020102.

It can be written as a sum of positive squares in only one way, i.e., 13659531876 + 6442470225 = 116874^2 + 80265^2 .

It is not a de Polignac number, because 20102002101 - 2¹¹ = 20102000053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2233555789 = 20102002101 / (2 + 0 + 1 + 0 + 2 + 0 + 0 + 2 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102000101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1116777886 + ... + 1116777903.

Almost surely, 2^20102002101 is an apocalyptic number.

It is an amenable number.

20102002101 is a deficient number, since it is larger than the sum of its proper divisors (8934223169).

20102002101 is a wasteful number, since it uses less digits than its factorization.

20102002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233555795 (or 2233555792 counting only the distinct ones).

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

Adding to 20102002101 its reverse (10120020102), we get a palindrome (30222022203).

The spelling of 20102002101 in words is "twenty billion, one hundred two million, two thousand, one hundred one".