21104132503 has 16 divisors (see below), whose sum is σ = 23132597760. Its totient is φ = 19164096000.

The previous prime is 21104132473. The next prime is 21104132587. The reversal of 21104132503 is 30523140112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21104132503 - 2²¹ = 21102035351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104132003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 710653 + ... + 739753.

It is an arithmetic number, because the mean of its divisors is an integer number (1445787360).

Almost surely, 2^21104132503 is an apocalyptic number.

21104132503 is a deficient number, since it is larger than the sum of its proper divisors (2028465257).

21104132503 is a wasteful number, since it uses less digits than its factorization.

21104132503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30618.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21104132503 its reverse (30523140112), we get a palindrome (51627272615).

The spelling of 21104132503 in words is "twenty-one billion, one hundred four million, one hundred thirty-two thousand, five hundred three".