20421408193 has 8 divisors (see below), whose sum is σ = 21081862656. Its totient is φ = 19761060000.

The previous prime is 20421408173. The next prime is 20421408223. The reversal of 20421408193 is 39180412402.

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 20421408193 - 2⁹ = 20421407681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421408143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 595605 + ... + 628957.

It is an arithmetic number, because the mean of its divisors is an integer number (2635232832).

Almost surely, 2^20421408193 is an apocalyptic number.

It is an amenable number.

20421408193 is a deficient number, since it is larger than the sum of its proper divisors (660454463).

20421408193 is a wasteful number, since it uses less digits than its factorization.

20421408193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53135.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 20421408193 in words is "twenty billion, four hundred twenty-one million, four hundred eight thousand, one hundred ninety-three".