21001112103 has 16 divisors (see below), whose sum is σ = 28335600000. Its totient is φ = 13834240800.

The previous prime is 21001112071. The next prime is 21001112117. The reversal of 21001112103 is 30121110012.

It is not a de Polignac number, because 21001112103 - 2⁵ = 21001112071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001110103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81748 + ... + 220646.

It is an arithmetic number, because the mean of its divisors is an integer number (1770975000).

Almost surely, 2^21001112103 is an apocalyptic number.

21001112103 is a deficient number, since it is larger than the sum of its proper divisors (7334487897).

21001112103 is a wasteful number, since it uses less digits than its factorization.

21001112103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139502.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21001112103 its reverse (30121110012), we get a palindrome (51122222115).

The spelling of 21001112103 in words is "twenty-one billion, one million, one hundred twelve thousand, one hundred three".