21122160503 has 4 divisors (see below), whose sum is σ = 21124551480. Its totient is φ = 21119769528.

The previous prime is 21122160487. The next prime is 21122160571. The reversal of 21122160503 is 30506122112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21122160503 - 2⁴ = 21122160487 is a prime.

It is a super-2 number, since 2×21122160503² (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 (21122160203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1182188 + ... + 1199921.

It is an arithmetic number, because the mean of its divisors is an integer number (5281137870).

Almost surely, 2^21122160503 is an apocalyptic number.

21122160503 is a deficient number, since it is larger than the sum of its proper divisors (2390977).

21122160503 is an equidigital number, since it uses as much as digits as its factorization.

21122160503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390976.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21122160503 its reverse (30506122112), we get a palindrome (51628282615).

The spelling of 21122160503 in words is "twenty-one billion, one hundred twenty-two million, one hundred sixty thousand, five hundred three".