21333125413 has 4 divisors (see below), whose sum is σ = 21338753548. Its totient is φ = 21327497280.

The previous prime is 21333125389. The next prime is 21333125417. The reversal of 21333125413 is 31452133312.

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 12156826564 + 9176298849 = 110258^2 + 95793^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333125413 - 2³³ = 12743190821 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 (21333125417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2808378 + ... + 2815963.

It is an arithmetic number, because the mean of its divisors is an integer number (5334688387).

Almost surely, 2^21333125413 is an apocalyptic number.

It is an amenable number.

21333125413 is a deficient number, since it is larger than the sum of its proper divisors (5628135).

21333125413 is an equidigital number, since it uses as much as digits as its factorization.

21333125413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5628134.

The product of its digits is 6480, while the sum is 28.

Adding to 21333125413 its reverse (31452133312), we get a palindrome (52785258725).

The spelling of 21333125413 in words is "twenty-one billion, three hundred thirty-three million, one hundred twenty-five thousand, four hundred thirteen".