21271102503 has 32 divisors (see below), whose sum is σ = 33569095680. Its totient is φ = 11728708320.

The previous prime is 21271102493. The next prime is 21271102519. The reversal of 21271102503 is 30520117212.

It is not a de Polignac number, because 21271102503 - 2⁸ = 21271102247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271102583) 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 31 ways as a sum of consecutive naturals, for example, 81693 + ... + 221846.

It is an arithmetic number, because the mean of its divisors is an integer number (1049034240).

Almost surely, 2^21271102503 is an apocalyptic number.

21271102503 is a deficient number, since it is larger than the sum of its proper divisors (12297993177).

21271102503 is a wasteful number, since it uses less digits than its factorization.

21271102503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303667.

The product of its (nonzero) digits is 840, while the sum is 24.

Adding to 21271102503 its reverse (30520117212), we get a palindrome (51791219715).

The spelling of 21271102503 in words is "twenty-one billion, two hundred seventy-one million, one hundred two thousand, five hundred three".