21112443503 has 6 divisors (see below), whose sum is σ = 22282108344. Its totient is φ = 20001261924.

The previous prime is 21112443467. The next prime is 21112443511. The reversal of 21112443503 is 30534421112.

It is a happy number.

It is not a de Polignac number, because 21112443503 - 2¹⁰ = 21112442479 is a prime.

It is a super-2 number, since 2×21112443503² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112443533) 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 5 ways as a sum of consecutive naturals, for example, 29241251 + ... + 29241972.

It is an arithmetic number, because the mean of its divisors is an integer number (3713684724).

Almost surely, 2^21112443503 is an apocalyptic number.

21112443503 is a deficient number, since it is larger than the sum of its proper divisors (1169664841).

21112443503 is an equidigital number, since it uses as much as digits as its factorization.

21112443503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58483261 (or 58483242 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21112443503 its reverse (30534421112), we get a palindrome (51646864615).

The spelling of 21112443503 in words is "twenty-one billion, one hundred twelve million, four hundred forty-three thousand, five hundred three".