21424433413 has 8 divisors (see below), whose sum is σ = 22737091608. Its totient is φ = 20117597184.

The previous prime is 21424433353. The next prime is 21424433453. The reversal of 21424433413 is 31433442412.

It can be written as a sum of positive squares in 4 ways, for example, as 3826288449 + 17598144964 = 61857^2 + 132658^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21424433413 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 (21424433453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1447906 + ... + 1462627.

It is an arithmetic number, because the mean of its divisors is an integer number (2842136451).

Almost surely, 2^21424433413 is an apocalyptic number.

It is an amenable number.

21424433413 is a deficient number, since it is larger than the sum of its proper divisors (1312658195).

21424433413 is a wasteful number, since it uses less digits than its factorization.

21424433413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2910983.

The product of its digits is 27648, while the sum is 31.

Adding to 21424433413 its reverse (31433442412), we get a palindrome (52857875825).

The spelling of 21424433413 in words is "twenty-one billion, four hundred twenty-four million, four hundred thirty-three thousand, four hundred thirteen".