21100112003 has 16 divisors (see below), whose sum is σ = 22729973760. Its totient is φ = 19513735296.

The previous prime is 21100111999. The next prime is 21100112017. The reversal of 21100112003 is 30021100112.

It is a cyclic number.

It is not a de Polignac number, because 21100112003 - 2² = 21100111999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100112603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3976250 + ... + 3981552.

It is an arithmetic number, because the mean of its divisors is an integer number (1420623360).

Almost surely, 2^21100112003 is an apocalyptic number.

21100112003 is a deficient number, since it is larger than the sum of its proper divisors (1629861757).

21100112003 is a wasteful number, since it uses less digits than its factorization.

21100112003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9346.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21100112003 its reverse (30021100112), we get a palindrome (51121212115).

The spelling of 21100112003 in words is "twenty-one billion, one hundred million, one hundred twelve thousand, three".