428105122821 has 12 divisors (see below), whose sum is σ = 618477430272. Its totient is φ = 285355708776.

The previous prime is 428105122799. The next prime is 428105122831. The reversal of 428105122821 is 128221501824.

It is a happy number.

428105122821 is a `hidden beast` number, since 42 + 81 + 0 + 512 + 2 + 8 + 21 = 666.

It is not a de Polignac number, because 428105122821 - 2⁵ = 428105122789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428105122831) 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 11 ways as a sum of consecutive naturals, for example, 3918661 + ... + 4026426.

It is an arithmetic number, because the mean of its divisors is an integer number (51539785856).

Almost surely, 2^428105122821 is an apocalyptic number.

It is an amenable number.

428105122821 is a deficient number, since it is larger than the sum of its proper divisors (190372307451).

428105122821 is a wasteful number, since it uses less digits than its factorization.

428105122821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7951080 (or 7951077 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The spelling of 428105122821 in words is "four hundred twenty-eight billion, one hundred five million, one hundred twenty-two thousand, eight hundred twenty-one".