21202103101 has 4 divisors (see below), whose sum is σ = 21222510400. Its totient is φ = 21181695804.

The previous prime is 21202103099. The next prime is 21202103107. The reversal of 21202103101 is 10130120212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21202103101 - 2¹ = 21202103099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202103107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10202091 + ... + 10204168.

It is an arithmetic number, because the mean of its divisors is an integer number (5305627600).

Almost surely, 2^21202103101 is an apocalyptic number.

It is an amenable number.

21202103101 is a deficient number, since it is larger than the sum of its proper divisors (20407299).

21202103101 is a wasteful number, since it uses less digits than its factorization.

21202103101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20407298.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21202103101 its reverse (10130120212), we get a palindrome (31332223313).

The spelling of 21202103101 in words is "twenty-one billion, two hundred two million, one hundred three thousand, one hundred one".