21230146644425 has 6 divisors (see below), whose sum is σ = 26325381839118. Its totient is φ = 16984117315520.

The previous prime is 21230146644379. The next prime is 21230146644451. The reversal of 21230146644425 is 52444664103212.

It can be written as a sum of positive squares in 3 ways, for example, as 3480541715641 + 17749604928784 = 1865621^2 + 4213028^2 .

It is not a de Polignac number, because 21230146644425 - 2¹⁰ = 21230146643401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 424602932864 + ... + 424602932913.

It is an arithmetic number, because the mean of its divisors is an integer number (4387563639853).

Almost surely, 2^{21230146644425} is an apocalyptic number.

21230146644425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21230146644425 is a deficient number, since it is larger than the sum of its proper divisors (5095235194693).

21230146644425 is an equidigital number, since it uses as much as digits as its factorization.

21230146644425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849205865787 (or 849205865782 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 44.

The spelling of 21230146644425 in words is "twenty-one trillion, two hundred thirty billion, one hundred forty-six million, six hundred forty-four thousand, four hundred twenty-five".