21230115332453 has 4 divisors (see below), whose sum is σ = 21280543160268. Its totient is φ = 21179687504640.

The previous prime is 21230115332429. The next prime is 21230115332501. The reversal of 21230115332453 is 35423351103212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5587441705729 + 15642673626724 = 2363777^2 + 3955082^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230115332453 - 2²⁰ = 21230114283877 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 (21230115332053) 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, 25213913276 + ... + 25213914117.

It is an arithmetic number, because the mean of its divisors is an integer number (5320135790067).

Almost surely, 2^{21230115332453} is an apocalyptic number.

It is an amenable number.

21230115332453 is a deficient number, since it is larger than the sum of its proper divisors (50427827815).

21230115332453 is an equidigital number, since it uses as much as digits as its factorization.

21230115332453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50427827814.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 21230115332453 its reverse (35423351103212), we get a palindrome (56653466435665).

The spelling of 21230115332453 in words is "twenty-one trillion, two hundred thirty billion, one hundred fifteen million, three hundred thirty-two thousand, four hundred fifty-three".