21304442413 has 8 divisors (see below), whose sum is σ = 21327837696. Its totient is φ = 21281064000.

The previous prime is 21304442389. The next prime is 21304442429. The reversal of 21304442413 is 31424440312.

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-21304442413 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 (21304412413) 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, 6280948 + ... + 6284338.

It is an arithmetic number, because the mean of its divisors is an integer number (2665979712).

Almost surely, 2^21304442413 is an apocalyptic number.

It is an amenable number.

21304442413 is a deficient number, since it is larger than the sum of its proper divisors (23395283).

21304442413 is a wasteful number, since it uses less digits than its factorization.

21304442413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8435.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21304442413 its reverse (31424440312), we get a palindrome (52728882725).

The spelling of 21304442413 in words is "twenty-one billion, three hundred four million, four hundred forty-two thousand, four hundred thirteen".