21202312103 has 8 divisors (see below), whose sum is σ = 24725728800. Its totient is φ = 18173410080.

The previous prime is 21202312099. The next prime is 21202312121. The reversal of 21202312103 is 30121320212.

It is not a de Polignac number, because 21202312103 - 2² = 21202312099 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 (21202311103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30906818 + ... + 30907503.

It is an arithmetic number, because the mean of its divisors is an integer number (3090716100).

Almost surely, 2^21202312103 is an apocalyptic number.

21202312103 is a deficient number, since it is larger than the sum of its proper divisors (3523416697).

21202312103 is an frugal number, since it uses more digits than its factorization.

21202312103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61814342 (or 61814328 counting only the distinct ones).

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

Adding to 21202312103 its reverse (30121320212), we get a palindrome (51323632315).

The spelling of 21202312103 in words is "twenty-one billion, two hundred two million, three hundred twelve thousand, one hundred three".