21202132103 has 4 divisors (see below), whose sum is σ = 21233636688. Its totient is φ = 21170627520.

The previous prime is 21202132051. The next prime is 21202132123. The reversal of 21202132103 is 30123120212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21202132103 - 2¹⁰ = 21202131079 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 (21202132123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15751283 + ... + 15752628.

It is an arithmetic number, because the mean of its divisors is an integer number (5308409172).

Almost surely, 2^21202132103 is an apocalyptic number.

21202132103 is a deficient number, since it is larger than the sum of its proper divisors (31504585).

21202132103 is an equidigital number, since it uses as much as digits as its factorization.

21202132103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31504584.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21202132103 its reverse (30123120212), we get a palindrome (51325252315).

The spelling of 21202132103 in words is "twenty-one billion, two hundred two million, one hundred thirty-two thousand, one hundred three".