21424442305 has 16 divisors (see below), whose sum is σ = 29535934464. Its totient is φ = 14614125120.

The previous prime is 21424442267. The next prime is 21424442329. The reversal of 21424442305 is 50324442412.

It is not a de Polignac number, because 21424442305 - 2²³ = 21416053697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1595742 + ... + 1609111.

It is an arithmetic number, because the mean of its divisors is an integer number (1845995904).

Almost surely, 2^21424442305 is an apocalyptic number.

It is an amenable number.

21424442305 is a deficient number, since it is larger than the sum of its proper divisors (8111492159).

21424442305 is a wasteful number, since it uses less digits than its factorization.

21424442305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205056.

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 21424442305 its reverse (50324442412), we get a palindrome (71748884717).

The spelling of 21424442305 in words is "twenty-one billion, four hundred twenty-four million, four hundred forty-two thousand, three hundred five".