21110240002503 has 4 divisors (see below), whose sum is σ = 28146986670008. Its totient is φ = 14073493335000.

The previous prime is 21110240002469. The next prime is 21110240002507. The reversal of 21110240002503 is 30520004201112.

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

It is not a de Polignac number, because 21110240002503 - 2¹⁷ = 21110239871431 is a prime.

It is a super-2 number, since 2×21110240002503² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110240002503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110240002507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518373333748 + ... + 3518373333753.

It is an arithmetic number, because the mean of its divisors is an integer number (7036746667502).

Almost surely, 2^{21110240002503} is an apocalyptic number.

21110240002503 is a deficient number, since it is larger than the sum of its proper divisors (7036746667505).

21110240002503 is an equidigital number, since it uses as much as digits as its factorization.

21110240002503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7036746667504.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21110240002503 its reverse (30520004201112), we get a palindrome (51630244203615).

The spelling of 21110240002503 in words is "twenty-one trillion, one hundred ten billion, two hundred forty million, two thousand, five hundred three".