21210302103 has 4 divisors (see below), whose sum is σ = 28280402808. Its totient is φ = 14140201400.

The previous prime is 21210302101. The next prime is 21210302111. The reversal of 21210302103 is 30120301212.

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 21210302103 - 2¹ = 21210302101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210302101) 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, 3535050348 + ... + 3535050353.

It is an arithmetic number, because the mean of its divisors is an integer number (7070100702).

Almost surely, 2^21210302103 is an apocalyptic number.

21210302103 is a deficient number, since it is larger than the sum of its proper divisors (7070100705).

21210302103 is an equidigital number, since it uses as much as digits as its factorization.

21210302103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070100704.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21210302103 its reverse (30120301212), we get a palindrome (51330603315).

The spelling of 21210302103 in words is "twenty-one billion, two hundred ten million, three hundred two thousand, one hundred three".