21323203102 has 4 divisors (see below), whose sum is σ = 31984804656. Its totient is φ = 10661601550.

The previous prime is 21323203087. The next prime is 21323203103. The reversal of 21323203102 is 20130232312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21323203102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323203103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330800774 + ... + 5330800777.

It is an arithmetic number, because the mean of its divisors is an integer number (7996201164).

Almost surely, 2^21323203102 is an apocalyptic number.

21323203102 is a deficient number, since it is larger than the sum of its proper divisors (10661601554).

21323203102 is a wasteful number, since it uses less digits than its factorization.

21323203102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661601553.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21323203102 its reverse (20130232312), we get a palindrome (41453435414).

The spelling of 21323203102 in words is "twenty-one billion, three hundred twenty-three million, two hundred three thousand, one hundred two".