21210303103 has 4 divisors (see below), whose sum is σ = 23138512488. Its totient is φ = 19282093720.

The previous prime is 21210303097. The next prime is 21210303161. The reversal of 21210303103 is 30130301212.

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 21210303103 - 2⁹ = 21210302591 is a prime.

It is a super-2 number, since 2×21210303103² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210303203) 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, 964104676 + ... + 964104697.

It is an arithmetic number, because the mean of its divisors is an integer number (5784628122).

Almost surely, 2^21210303103 is an apocalyptic number.

21210303103 is a deficient number, since it is larger than the sum of its proper divisors (1928209385).

21210303103 is a wasteful number, since it uses less digits than its factorization.

21210303103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928209384.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21210303103 its reverse (30130301212), we get a palindrome (51340604315).

The spelling of 21210303103 in words is "twenty-one billion, two hundred ten million, three hundred three thousand, one hundred three".