21404421313 has 8 divisors (see below), whose sum is σ = 23353842816. Its totient is φ = 19455594000.

The previous prime is 21404421281. The next prime is 21404421317. The reversal of 21404421313 is 31312440412.

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

It is a cyclic number.

It is not a de Polignac number, because 21404421313 - 2⁵ = 21404421281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404421317) 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 7 ways as a sum of consecutive naturals, for example, 71481 + ... + 218902.

It is an arithmetic number, because the mean of its divisors is an integer number (2919230352).

Almost surely, 2^21404421313 is an apocalyptic number.

It is an amenable number.

21404421313 is a deficient number, since it is larger than the sum of its proper divisors (1949421503).

21404421313 is a wasteful number, since it uses less digits than its factorization.

21404421313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297095.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21404421313 its reverse (31312440412), we get a palindrome (52716861725).

The spelling of 21404421313 in words is "twenty-one billion, four hundred four million, four hundred twenty-one thousand, three hundred thirteen".