20421408194 has 8 divisors (see below), whose sum is σ = 33416849808. Its totient is φ = 9282458260.

The previous prime is 20421408173. The next prime is 20421408223. The reversal of 20421408194 is 49180412402.

It is a happy number.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 464122892 + ... + 464122935.

It is an arithmetic number, because the mean of its divisors is an integer number (4177106226).

Almost surely, 2^20421408194 is an apocalyptic number.

20421408194 is a deficient number, since it is larger than the sum of its proper divisors (12995441614).

20421408194 is a wasteful number, since it uses less digits than its factorization.

20421408194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928245840.

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 20421408194 in words is "twenty billion, four hundred twenty-one million, four hundred eight thousand, one hundred ninety-four".