21434430444 has 36 divisors (see below), whose sum is σ = 58179169944. Its totient is φ = 6124122816.

The previous prime is 21434430427. The next prime is 21434430463. The reversal of 21434430444 is 44403443412.

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 11 ways as a sum of consecutive naturals, for example, 18225969 + ... + 18227144.

It is an arithmetic number, because the mean of its divisors is an integer number (1616088054).

Almost surely, 2^21434430444 is an apocalyptic number.

It is an amenable number.

21434430444 is an abundant number, since it is smaller than the sum of its proper divisors (36744739500).

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

21434430444 is a wasteful number, since it uses less digits than its factorization.

21434430444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36453134 (or 36453125 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 33.

Adding to 21434430444 its reverse (44403443412), we get a palindrome (65837873856).

The spelling of 21434430444 in words is "twenty-one billion, four hundred thirty-four million, four hundred thirty thousand, four hundred forty-four".