13404421421 has 8 divisors (see below), whose sum is σ = 13845030144. Its totient is φ = 12964325760.

The previous prime is 13404421417. The next prime is 13404421427. The reversal of 13404421421 is 12412440431.

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 13404421421 - 2² = 13404421417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13404421427) 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, 74795 + ... + 180008.

It is an arithmetic number, because the mean of its divisors is an integer number (1730628768).

Almost surely, 2^13404421421 is an apocalyptic number.

It is an amenable number.

13404421421 is a deficient number, since it is larger than the sum of its proper divisors (440608723).

13404421421 is a wasteful number, since it uses less digits than its factorization.

13404421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256531.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 13404421421 its reverse (12412440431), we get a palindrome (25816861852).

The spelling of 13404421421 in words is "thirteen billion, four hundred four million, four hundred twenty-one thousand, four hundred twenty-one".