21331310103 has 12 divisors (see below), whose sum is σ = 30822522120. Its totient is φ = 14215967376.

The previous prime is 21331310101. The next prime is 21331310107. The reversal of 21331310103 is 30101313312.

It is a happy number.

21331310103 is a `hidden beast` number, since 21 + 331 + 310 + 1 + 0 + 3 = 666.

It is not a de Polignac number, because 21331310103 - 2¹ = 21331310101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331310101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 381201 + ... + 433562.

It is an arithmetic number, because the mean of its divisors is an integer number (2568543510).

Almost surely, 2^21331310103 is an apocalyptic number.

21331310103 is a deficient number, since it is larger than the sum of its proper divisors (9491212017).

21331310103 is a wasteful number, since it uses less digits than its factorization.

21331310103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817678 (or 817675 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21331310103 its reverse (30101313312), we get a palindrome (51432623415).

The spelling of 21331310103 in words is "twenty-one billion, three hundred thirty-one million, three hundred ten thousand, one hundred three".