21430241565 has 48 divisors (see below), whose sum is σ = 37599198720. Its totient is φ = 10410071040.

The previous prime is 21430241549. The next prime is 21430241611. The reversal of 21430241565 is 56514203412.

It is not a de Polignac number, because 21430241565 - 2⁴ = 21430241549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54651 + ... + 214119.

It is an arithmetic number, because the mean of its divisors is an integer number (783316640).

Almost surely, 2^21430241565 is an apocalyptic number.

It is an amenable number.

21430241565 is a deficient number, since it is larger than the sum of its proper divisors (16168957155).

21430241565 is a wasteful number, since it uses less digits than its factorization.

21430241565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159542 (or 159525 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21430241565 its reverse (56514203412), we get a palindrome (77944444977).

The spelling of 21430241565 in words is "twenty-one billion, four hundred thirty million, two hundred forty-one thousand, five hundred sixty-five".