21312040430 has 16 divisors (see below), whose sum is σ = 38440452960. Its totient is φ = 8507309472.

The previous prime is 21312040411. The next prime is 21312040447. The reversal of 21312040430 is 3404021312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2183225 + ... + 2192964.

It is an arithmetic number, because the mean of its divisors is an integer number (2402528310).

Almost surely, 2^21312040430 is an apocalyptic number.

21312040430 is a deficient number, since it is larger than the sum of its proper divisors (17128412530).

21312040430 is a wasteful number, since it uses less digits than its factorization.

21312040430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4376683.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21312040430 its reverse (3404021312), we get a palindrome (24716061742).

The spelling of 21312040430 in words is "twenty-one billion, three hundred twelve million, forty thousand, four hundred thirty".