21230033645503 has 16 divisors (see below), whose sum is σ = 23265779402880. Its totient is φ = 19282421971456.

The previous prime is 21230033645489. The next prime is 21230033645519. The reversal of 21230033645503 is 30554633003212.

It is a de Polignac number, because none of the positive numbers 2^k-21230033645503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230033685503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9940375 + ... + 11885752.

It is an arithmetic number, because the mean of its divisors is an integer number (1454111212680).

Almost surely, 2^{21230033645503} is an apocalyptic number.

21230033645503 is a deficient number, since it is larger than the sum of its proper divisors (2035745757377).

21230033645503 is a wasteful number, since it uses less digits than its factorization.

21230033645503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21828146.

The product of its (nonzero) digits is 194400, while the sum is 37.

Adding to 21230033645503 its reverse (30554633003212), we get a palindrome (51784666648715).

The spelling of 21230033645503 in words is "twenty-one trillion, two hundred thirty billion, thirty-three million, six hundred forty-five thousand, five hundred three".