21584301842 has 4 divisors (see below), whose sum is σ = 32376452766. Its totient is φ = 10792150920.

The previous prime is 21584301799. The next prime is 21584301877. The reversal of 21584301842 is 24810348512.

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

It can be written as a sum of positive squares in only one way, i.e., 20778934201 + 805367641 = 144149^2 + 28379^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21584301796 and 21584301805.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5396075459 + ... + 5396075462.

Almost surely, 2^21584301842 is an apocalyptic number.

21584301842 is a deficient number, since it is larger than the sum of its proper divisors (10792150924).

21584301842 is a wasteful number, since it uses less digits than its factorization.

21584301842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10792150923.

The product of its (nonzero) digits is 61440, while the sum is 38.

The spelling of 21584301842 in words is "twenty-one billion, five hundred eighty-four million, three hundred one thousand, eight hundred forty-two".