21243340042430 has 64 divisors (see below), whose sum is σ = 44605278210240. Its totient is φ = 7198463232000.

The previous prime is 21243340042423. The next prime is 21243340042523. The reversal of 21243340042430 is 3424004334212.

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 31 ways as a sum of consecutive naturals, for example, 56049125 + ... + 56426864.

It is an arithmetic number, because the mean of its divisors is an integer number (696957472035).

Almost surely, 2^{21243340042430} is an apocalyptic number.

21243340042430 is an abundant number, since it is smaller than the sum of its proper divisors (23361938167810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21243340042430 is a wasteful number, since it uses less digits than its factorization.

21243340042430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112476125.

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 21243340042430 its reverse (3424004334212), we get a palindrome (24667344376642).

The spelling of 21243340042430 in words is "twenty-one trillion, two hundred forty-three billion, three hundred forty million, forty-two thousand, four hundred thirty".