21210143241503 has 32 divisors (see below), whose sum is σ = 22059770160960. Its totient is φ = 20368812441600.

The previous prime is 21210143241499. The next prime is 21210143241523. The reversal of 21210143241503 is 30514234101212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21210143241503 - 2² = 21210143241499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210143241523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5903183075 + ... + 5903186667.

It is an arithmetic number, because the mean of its divisors is an integer number (689367817530).

Almost surely, 2^{21210143241503} is an apocalyptic number.

21210143241503 is a deficient number, since it is larger than the sum of its proper divisors (849626919457).

21210143241503 is a wasteful number, since it uses less digits than its factorization.

21210143241503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5387.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21210143241503 its reverse (30514234101212), we get a palindrome (51724377342715).

The spelling of 21210143241503 in words is "twenty-one trillion, two hundred ten billion, one hundred forty-three million, two hundred forty-one thousand, five hundred three".