21428064189 has 32 divisors (see below), whose sum is σ = 36394871040. Its totient is φ = 12205947456.

The previous prime is 21428064181. The next prime is 21428064209. The reversal of 21428064189 is 98146082412.

It is not a de Polignac number, because 21428064189 - 2³ = 21428064181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21428064181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118914 + ... + 238739.

It is an arithmetic number, because the mean of its divisors is an integer number (1137339720).

Almost surely, 2^21428064189 is an apocalyptic number.

It is an amenable number.

21428064189 is a deficient number, since it is larger than the sum of its proper divisors (14966806851).

21428064189 is a wasteful number, since it uses less digits than its factorization.

21428064189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357986 (or 357980 counting only the distinct ones).

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

The spelling of 21428064189 in words is "twenty-one billion, four hundred twenty-eight million, sixty-four thousand, one hundred eighty-nine".