21113103105 has 12 divisors (see below), whose sum is σ = 36596045460. Its totient is φ = 11260321632.

The previous prime is 21113103091. The next prime is 21113103113. The reversal of 21113103105 is 50130131112.

It can be written as a sum of positive squares in 2 ways, for example, as 8879858289 + 12233244816 = 94233^2 + 110604^2 .

It is not a de Polignac number, because 21113103105 - 2⁶ = 21113103041 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234589990 + ... + 234590079.

It is an arithmetic number, because the mean of its divisors is an integer number (3049670455).

Almost surely, 2^21113103105 is an apocalyptic number.

It is an amenable number.

21113103105 is a deficient number, since it is larger than the sum of its proper divisors (15482942355).

21113103105 is a wasteful number, since it uses less digits than its factorization.

21113103105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469180080 (or 469180077 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

Adding to 21113103105 its reverse (50130131112), we get a palindrome (71243234217).

The spelling of 21113103105 in words is "twenty-one billion, one hundred thirteen million, one hundred three thousand, one hundred five".