21428064198 has 24 divisors (see below), whose sum is σ = 47063468088. Its totient is φ = 7044842592.

The previous prime is 21428064181. The next prime is 21428064209. The reversal of 21428064198 is 89146082412.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8152440 + ... + 8155067.

It is an arithmetic number, because the mean of its divisors is an integer number (1960977837).

Almost surely, 2^21428064198 is an apocalyptic number.

21428064198 is an abundant number, since it is smaller than the sum of its proper divisors (25635403890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21428064198 is a wasteful number, since it uses less digits than its factorization.

21428064198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16307588 (or 16307585 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 21428064198 in words is "twenty-one billion, four hundred twenty-eight million, sixty-four thousand, one hundred ninety-eight".