21430241564 has 12 divisors (see below), whose sum is σ = 37512623064. Its totient is φ = 10712349264.

The previous prime is 21430241549. The next prime is 21430241611. The reversal of 21430241564 is 46514203412.

It is a self number, because there is not a number n which added to its sum of digits gives 21430241564.

It is a congruent number.

It is an unprimeable number.

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, 675434 + ... + 706449.

It is an arithmetic number, because the mean of its divisors is an integer number (3126051922).

Almost surely, 2^21430241564 is an apocalyptic number.

It is an amenable number.

21430241564 is a deficient number, since it is larger than the sum of its proper divisors (16082381500).

21430241564 is a wasteful number, since it uses less digits than its factorization.

21430241564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385764 (or 1385762 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 21430241564 its reverse (46514203412), we get a palindrome (67944444976).

The spelling of 21430241564 in words is "twenty-one billion, four hundred thirty million, two hundred forty-one thousand, five hundred sixty-four".