21428046619 has 4 divisors (see below), whose sum is σ = 24489196144. Its totient is φ = 18366897096.

The previous prime is 21428046599. The next prime is 21428046649. The reversal of 21428046619 is 91664082412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21428046619 - 2¹¹ = 21428044571 is a prime.

It is a super-2 number, since 2×21428046619² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21428046649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530574752 + ... + 1530574765.

It is an arithmetic number, because the mean of its divisors is an integer number (6122299036).

Almost surely, 2^21428046619 is an apocalyptic number.

21428046619 is a deficient number, since it is larger than the sum of its proper divisors (3061149525).

21428046619 is an equidigital number, since it uses as much as digits as its factorization.

21428046619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3061149524.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 21428046619 in words is "twenty-one billion, four hundred twenty-eight million, forty-six thousand, six hundred nineteen".