21434055043 has 4 divisors (see below), whose sum is σ = 21434480640. Its totient is φ = 21433629448.

The previous prime is 21434055007. The next prime is 21434055053. The reversal of 21434055043 is 34055043412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21434055043 - 2²¹ = 21431957891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21434054996 and 21434055014.

It is not an unprimeable number, because it can be changed into a prime (21434055053) 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 3 ways as a sum of consecutive naturals, for example, 125248 + ... + 241981.

It is an arithmetic number, because the mean of its divisors is an integer number (5358620160).

Almost surely, 2^21434055043 is an apocalyptic number.

21434055043 is a deficient number, since it is larger than the sum of its proper divisors (425597).

21434055043 is an equidigital number, since it uses as much as digits as its factorization.

21434055043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425596.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 21434055043 its reverse (34055043412), we get a palindrome (55489098455).

The spelling of 21434055043 in words is "twenty-one billion, four hundred thirty-four million, fifty-five thousand, forty-three".