21100032103 has 16 divisors (see below), whose sum is σ = 22987220256. Its totient is φ = 19289733120.

The previous prime is 21100032073. The next prime is 21100032127. The reversal of 21100032103 is 30123000112.

It is a cyclic number.

It is not a de Polignac number, because 21100032103 - 2⁵ = 21100032071 is a prime.

It is a super-3 number, since 3×21100032103³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100032203) 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, 52575 + ... + 212047.

It is an arithmetic number, because the mean of its divisors is an integer number (1436701266).

Almost surely, 2^21100032103 is an apocalyptic number.

21100032103 is a deficient number, since it is larger than the sum of its proper divisors (1887188153).

21100032103 is a wasteful number, since it uses less digits than its factorization.

21100032103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159714.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21100032103 its reverse (30123000112), we get a palindrome (51223032215).

The spelling of 21100032103 in words is "twenty-one billion, one hundred million, thirty-two thousand, one hundred three".