21431233043 has 8 divisors (see below), whose sum is σ = 24396028416. Its totient is φ = 18635854600.

The previous prime is 21431233003. The next prime is 21431233051. The reversal of 21431233043 is 34033213412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21431233043 - 2⁸ = 21431232787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431233003) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 42353963 + ... + 42354468.

It is an arithmetic number, because the mean of its divisors is an integer number (3049503552).

Almost surely, 2^21431233043 is an apocalyptic number.

21431233043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21431233043 is a deficient number, since it is larger than the sum of its proper divisors (2964795373).

21431233043 is a wasteful number, since it uses less digits than its factorization.

21431233043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84708465.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21431233043 its reverse (34033213412), we get a palindrome (55464446455).

The spelling of 21431233043 in words is "twenty-one billion, four hundred thirty-one million, two hundred thirty-three thousand, forty-three".